How to use the rope.base.exceptions.RefactoringError function in rope

def _check_exceptional_conditions(self):
        if self.old_pyname is None or \
           not isinstance(self.old_pyname.get_object(), pyobjects.PyDefinedObject):
            raise exceptions.RefactoringError(
                'Move refactoring should be performed on a class/function.')
        moving_pyobject = self.old_pyname.get_object()
        if not self._is_global(moving_pyobject):
            raise exceptions.RefactoringError(
                'Move refactoring should be performed on a global class/function.')

def _check_exceptional_conditions(self):
        if self.old_pyname is None or \
           not isinstance(self.old_pyname.get_object(), pyobjects.PyDefinedObject):
            raise exceptions.RefactoringError(
                'Move refactoring should be performed on a class/function.')
        moving_pyobject = self.old_pyname.get_object()
        if not self._is_global(moving_pyobject):
            raise exceptions.RefactoringError(
                'Move refactoring should be performed on a global class/function.')

def _check_nothing_after_return(self, source, offset):
        lines = codeanalyze.SourceLinesAdapter(source)
        lineno = lines.get_line_number(offset)
        logical_lines = codeanalyze.LogicalLineFinder(lines)
        lineno = logical_lines.logical_line_in(lineno)[1]
        if source[lines.get_line_end(lineno):len(source)].strip() != '':
            raise rope.base.exceptions.RefactoringError(
                'Cannot inline functions with statements after return statement.')

def one_line_conditions(self, info):
        if self._is_region_on_a_word(info):
            raise RefactoringError('Should extract complete statements.')
        if info.variable and not info.one_line:
            raise RefactoringError('Extract variable should not '
                                   'span multiple lines.')

def multi_line_conditions(self, info):
        node = _parse_text(info.source[info.region[0]:info.region[1]])
        count = usefunction._return_count(node)
        if count > 1:
            raise RefactoringError('Extracted piece can have only one '
                                   'return statement.')
        if usefunction._yield_count(node):
            raise RefactoringError('Extracted piece cannot '
                                   'have yield statements.')
        if count == 1 and not usefunction._returns_last(node):
            raise RefactoringError('Return should be the last statement.')
        if info.region != info.lines_region:
            raise RefactoringError('Extracted piece should '
                                   'contain complete statements.')

def get_changes(self, dest, resources=None,
                    task_handle=taskhandle.NullTaskHandle()):
        if resources is None:
            resources = self.pycore.get_python_files()
        if dest is None or not dest.exists():
            raise exceptions.RefactoringError(
                'Move destination does not exist.')
        if dest.is_folder() and dest.has_child('__init__.py'):
            dest = dest.get_child('__init__.py')
        if dest.is_folder():
            raise exceptions.RefactoringError(
                'Move destination for non-modules should not be folders.')
        if self.source == dest:
            raise exceptions.RefactoringError(
                'Moving global elements to the same module.')
        return self._calculate_changes(dest, resources, task_handle)

def one_line_conditions(self, info):
        if self._is_region_on_a_word(info):
            raise RefactoringError('Should extract complete statements.')
        if info.variable and not info.one_line:
            raise RefactoringError('Extract variable should not '
                                   'span multiple lines.')

def __init__(self, project, resource, offset):
        self.project = project
        self.resource = resource
        self.offset = offset
        self.pymodule = self.project.get_pymodule(self.resource)
        scope = self.pymodule.get_scope().get_inner_scope_for_offset(offset)
        if scope.get_kind() != 'Function':
            raise exceptions.RefactoringError(
                'Introduce parameter should be performed inside functions')
        self.pyfunction = scope.pyobject
        self.name, self.pyname = self._get_name_and_pyname()
        if self.pyname is None:
            raise exceptions.RefactoringError(
                'Cannot find the definition of <%s>' % self.name)

def multi_line_conditions(self, info):
        node = _parse_text(info.source[info.region[0]:info.region[1]])
        count = usefunction._return_count(node)
        if count > 1:
            raise RefactoringError('Extracted piece can have only one '
                                   'return statement.')
        if usefunction._yield_count(node):
            raise RefactoringError('Extracted piece cannot '
                                   'have yield statements.')
        if count == 1 and not usefunction._returns_last(node):
            raise RefactoringError('Return should be the last statement.')
        if info.region != info.lines_region:
            raise RefactoringError('Extracted piece should '
                                   'contain complete statements.')