How to use the cumulusci.core.exceptions.FlowConfigError function in cumulusci

def _check_old_yaml_format(self):
        if self.flow_config.steps is None:
            if "tasks" in self.flow_config.config:
                raise FlowConfigError(
                    'Old flow syntax detected.  Please change from "tasks" to "steps" in the flow definition.'
                )
            else:
                raise FlowConfigError("No steps found in the flow definition")

def _get_steps_ordered(self):
        if self.flow_config.steps is None:
            if self.flow_config.tasks:
                raise FlowConfigError(
                    'Old flow syntax detected.  Please change from "tasks" to "steps" in the flow definition'
                )
            else:
                raise FlowConfigError("No steps found in the flow definition")
        if not self.nested:
            self._check_infinite_flows(self.flow_config.steps)
        steps = []
        for step_num, config in list(self.flow_config.steps.items()):
            if "flow" in config and "task" in config:
                raise FlowConfigError(
                    '"flow" and "task" in same config item: {}'.format(config)
                )
            if ("flow" in config and config["flow"] == "None") or (
                "task" in config and config["task"] == "None"
            ):
                # allows skipping flows/tasks using YAML overrides

def _get_steps_ordered(self):
        if self.flow_config.steps is None:
            if self.flow_config.tasks:
                raise FlowConfigError(
                    'Old flow syntax detected.  Please change from "tasks" to "steps" in the flow definition'
                )
            else:
                raise FlowConfigError("No steps found in the flow definition")
        if not self.nested:
            self._check_infinite_flows(self.flow_config.steps)
        steps = []
        for step_num, config in list(self.flow_config.steps.items()):
            if "flow" in config and "task" in config:
                raise FlowConfigError(
                    '"flow" and "task" in same config item: {}'.format(config)
                )
            if ("flow" in config and config["flow"] == "None") or (
                "task" in config and config["task"] == "None"
            ):
                # allows skipping flows/tasks using YAML overrides
                continue
            parsed_step_num = LooseVersion(str(step_num))
            if "flow" in config:  # nested flow
                flow_config = self.project_config.get_flow(config["flow"])
                steps.append(
                    (
                        parsed_step_num,
                        {"step_config": config, "flow_config": flow_config},
                    )
                )

def _get_steps_ordered(self):
        if self.flow_config.steps is None:
            if self.flow_config.tasks:
                raise FlowConfigError(
                    'Old flow syntax detected.  Please change from "tasks" to "steps" in the flow definition'
                )
            else:
                raise FlowConfigError("No steps found in the flow definition")
        if not self.nested:
            self._check_infinite_flows(self.flow_config.steps)
        steps = []
        for step_num, config in list(self.flow_config.steps.items()):
            if "flow" in config and "task" in config:
                raise FlowConfigError(
                    '"flow" and "task" in same config item: {}'.format(config)
                )
            if ("flow" in config and config["flow"] == "None") or (
                "task" in config and config["task"] == "None"
            ):
                # allows skipping flows/tasks using YAML overrides
                continue
            parsed_step_num = LooseVersion(str(step_num))
            if "flow" in config:  # nested flow
                flow_config = self.project_config.get_flow(config["flow"])
                steps.append(
                    (
                        parsed_step_num,
                        {"step_config": config, "flow_config": flow_config},
                    )
                )

def _get_steps_ordered(self):
        if self.flow_config.steps is None:
            if self.flow_config.tasks:
                raise FlowConfigError(
                    'Old flow syntax detected.  Please change from "tasks" to "steps" in the flow definition'
                )
            else:
                raise FlowConfigError("No steps found in the flow definition")
        if not self.nested:
            self._check_infinite_flows(self.flow_config.steps)
        steps = []
        for step_num, config in list(self.flow_config.steps.items()):
            if "flow" in config and "task" in config:
                raise FlowConfigError(
                    '"flow" and "task" in same config item: {}'.format(config)
                )
            if ("flow" in config and config["flow"] == "None") or (
                "task" in config and config["task"] == "None"
            ):
                # allows skipping flows/tasks using YAML overrides
                continue
            parsed_step_num = LooseVersion(str(step_num))
            if "flow" in config:  # nested flow
                flow_config = self.project_config.get_flow(config["flow"])