How to use the offlineimap.OfflineImapError.ERROR function in offlineimap

except self.readonly as e:
            # pass self.readonly to our callers
            raise
        except self.abort as e:
            # self.abort is raised when we are supposed to retry
            errstr = "Server '%s' closed connection, error on SELECT '%s'. Ser"\
                "ver said: %s" % (self.host, mailbox, e.args[0])
            severity = OfflineImapError.ERROR.FOLDER_RETRY
            six.reraise(OfflineImapError,
                        OfflineImapError(errstr, severity),
                        exc_info()[2])
        if result[0] != 'OK':
            #in case of error, bail out with OfflineImapError
            errstr = "Error SELECTing mailbox '%s', server reply:\n%s" %\
                (mailbox, result)
            severity = OfflineImapError.ERROR.FOLDER
            raise OfflineImapError(errstr, severity)
        return result

# positive UID, so simply return here.
        if uid < 0:
            return uid

        # If msg uid already exists, just modify the flags.
        if uid in self.r2l:
            self.savemessageflags(uid, flags)
            return uid

        newluid = self._mb.savemessage(-1, content, flags, rtime)
        if newluid < 1:
            raise OfflineImapError("server of repository '%s' did not return "
                "a valid UID (got '%s') for UID '%s' from '%s'"% (
                    self._mb.getname(), newluid, uid, self.getname()
                ),
                OfflineImapError.ERROR.MESSAGE
            )
        with self.maplock:
            self.diskl2r[newluid] = uid
            self.diskr2l[uid] = newluid
            self.l2r[newluid] = uid
            self.r2l[uid] = newluid
            self._savemaps()
        return uid

continue

            tried_to_authn = True
            self.ui.debug('imap', u'Attempting '
              '%s authentication'% m)
            try:
                if func(imapobj):
                    return
            except (imapobj.error, OfflineImapError) as e:
                self.ui.warn('%s authentication failed: %s'% (m, e))
                exc_stack.append((m, e))

        if len(exc_stack):
            msg = "\n\t".join([": ".join((x[0], str(x[1]))) for x in exc_stack])
            raise OfflineImapError("All authentication types "
              "failed:\n\t%s"% msg, OfflineImapError.ERROR.REPO)

        if not tried_to_authn:
            methods = ", ".join([x[5:] for x in
                [x for x in imapobj.capabilities if x[0:5] == "AUTH="]])
            raise OfflineImapError(u"Repository %s: no supported "
              "authentication mechanisms found; configured %s, "
              "server advertises %s"% (self.repos,
              ", ".join(self.authmechs), methods),
              OfflineImapError.ERROR.REPO)

:returns: hostname as string or throws Exception"""
        if self._host:  # Use cached value if possible.
            return self._host

        # 1) Check for remotehosteval setting.
        if self.config.has_option(self.getsection(), 'remotehosteval'):
            host = self.getconf('remotehosteval')
            try:
                host = self.localeval.eval(host)
            except Exception as e:
                six.reraise(OfflineImapError,
                            OfflineImapError(
                                "remotehosteval option for repository "
                                "'%s' failed:\n%s"% (self, e),
                                OfflineImapError.ERROR.REPO),
                            exc_info()[2])
            if host:
                self._host = host
                return self._host
        # 2) Check for plain remotehost setting.
        host = self.getconf('remotehost', None)
        if host != None:
            self._host = host
            return self._host

        # No success.
        raise OfflineImapError("No remote host for repository "
            "'%s' specified."% self, OfflineImapError.ERROR.REPO)

if e.severity >= OfflineImapError.ERROR.CRITICAL:
                raise
            return

        # Loop account sync if needed (bail out after 3 failures).
        looping = 3
        while looping:
            self.ui.acct(self)
            try:
                self.__lock()
                self.__sync()
            except (KeyboardInterrupt, SystemExit):
                raise
            except OfflineImapError as e:
                # Stop looping and bubble up Exception if needed.
                if e.severity >= OfflineImapError.ERROR.REPO:
                    if looping:
                        looping -= 1
                    if e.severity >= OfflineImapError.ERROR.CRITICAL:
                        raise
                self.ui.error(e, exc_info()[2])
            except Exception as e:
                self.ui.error(e, exc_info()[2], msg=
                    "While attempting to sync account '%s'"% self)
            else:
                # After success sync, reset the looping counter to 3.
                if self.refreshperiod:
                    looping = 3
            finally:
                self.ui.acctdone(self)
                self._unlock()
                if looping and self._sleeper() >= 2:

if self.__getselectedfolder() == mailbox and \
            self.is_readonly == readonly and \
            not force:
            # No change; return.
            return
        try:
            result = super(UsefulIMAPMixIn, self).select(mailbox, readonly)
        except self.readonly as e:
            # pass self.readonly to our callers
            raise
        except self.abort as e:
            # self.abort is raised when we are supposed to retry
            errstr = "Server '%s' closed connection, error on SELECT '%s'. Ser"\
                "ver said: %s" % (self.host, mailbox, e.args[0])
            severity = OfflineImapError.ERROR.FOLDER_RETRY
            six.reraise(OfflineImapError,
                        OfflineImapError(errstr, severity),
                        exc_info()[2])
        if result[0] != 'OK':
            #in case of error, bail out with OfflineImapError
            errstr = "Error SELECTing mailbox '%s', server reply:\n%s" %\
                (mailbox, result)
            severity = OfflineImapError.ERROR.FOLDER
            raise OfflineImapError(errstr, severity)
        return result

if infomatch:
                filename = filename[:-len(infomatch.group())] #strip off
            infostr = '%s2,%s'% (self.infosep, ''.join(sorted(flags)))
            filename += infostr

        newfilename = os.path.join(dir_prefix, filename)
        if (newfilename != oldfilename):
            try:
                os.rename(os.path.join(self.getfullname(), oldfilename),
                          os.path.join(self.getfullname(), newfilename))
            except OSError as e:
                six.reraise(OfflineImapError,
                            OfflineImapError(
                                "Can't rename file '%s' to '%s': %s"%
                                (oldfilename, newfilename, e[1]),
                                OfflineImapError.ERROR.FOLDER),
                            exc_info()[2])

            self.messagelist[uid]['flags'] = flags
            self.messagelist[uid]['filename'] = newfilename

the UIDs of the messages in localfolder might not be in the same
        order as those of corresponding messages in remotefolder, so if L in
        local corresponds to R in remote, the ranges [L, ...] and [R, ...]
        might not correspond. But, if we're cloning a folder into a new one,
        [min_uid, ...] does correspond to [1, ...].

        This is just for IMAP-IMAP. For Maildir-IMAP, use maxage instead."""

        new.cachemessagelist()
        min_uid = partial.retrieve_min_uid()
        if min_uid == None: # min_uid file didn't exist
            if len(new.getmessageuidlist()) > 0:
                raise OfflineImapError("To use startdate on Repository %s, "
                    "Repository %s must be empty"%
                    (partial.repository.name, new.repository.name),
                    OfflineImapError.ERROR.MESSAGE)
            else:
                partial.cachemessagelist(min_date=date)
                # messagelist.keys() instead of getuidmessagelist() because in
                # the UID mapped case we want the actual local UIDs, not their
                # remote counterparts.
                positive_uids = [uid for uid in list(partial.messagelist.keys()) if uid > 0]
                if len(positive_uids) > 0:
                    min_uid = min(positive_uids)
                else:
                    min_uid = 1
                partial.save_min_uid(min_uid)
        else:
            partial.cachemessagelist(min_uid=min_uid)

def open(self, host=None, port=None):
        if not self.ca_certs and not self._fingerprint:
            raise OfflineImapError("No CA certificates "
              "and no server fingerprints configured.  "
              "You must configure at least something, otherwise "
              "having SSL helps nothing.", OfflineImapError.ERROR.REPO)
        super(WrappedIMAP4_SSL, self).open(host, port)
        if self._fingerprint:
            server_cert = self.sock.getpeercert(True)
            hashes = sha512, sha384, sha256, sha224, sha1
            server_fingerprints = [hash(server_cert).hexdigest() for hash in hashes]
            # compare fingerprints
            matches = [(server_fingerprint in self._fingerprint) for server_fingerprint in server_fingerprints]
            if not any(matches):
                raise OfflineImapError("Server SSL fingerprint(s) '%s' "
                      "for hostname '%s' "
                      "does not match configured fingerprint(s) %s.  "
                      "Please verify and set 'cert_fingerprint' accordingly "
                      "if not set yet."%
                      (zip([hash.__name__ for hash in hashes], server_fingerprints), host, self._fingerprint),
                      OfflineImapError.ERROR.REPO)

imapobj.identifier)
                self.parent.releaseconnection(imapobj, True)
            else:
                self.parent.releaseconnection(imapobj)


        while not self.stop_sig.isSet():
            self.needsync = False

            success = False # Successfully selected FOLDER?
            while not success:
                imapobj = self.parent.acquireconnection()
                try:
                    imapobj.select(self.folder)
                except OfflineImapError as e:
                    if e.severity == OfflineImapError.ERROR.FOLDER_RETRY:
                        # Connection closed, release connection and retry.
                        self.ui.error(e, exc_info()[2])
                        self.parent.releaseconnection(imapobj, True)
                    elif e.severity == OfflineImapError.ERROR.FOLDER:
                        # Just continue the process on such error for now.
                        self.ui.error(e, exc_info()[2])
                    else:
                        # Stops future attempts to sync this account.
                        raise
                else:
                    success = True
            if "IDLE" in imapobj.capabilities:
                imapobj.idle(callback=callback)
            else:
                self.ui.warn("IMAP IDLE not supported on server '%s'."
                    "Sleep until next refresh cycle."% imapobj.identifier)