Problem: If, when running a data import, you receive an error similar to the error shown in the stack trace below, this indicates the workflows the issues being imported use contain a validator on the Create transition, which is failing, and this is why the issue cannot be imported.
Project Configurator uses the built-in Jira data import functionality to import issues, and this function executes the create a transition in the workflow when creating an issue. If a validator on the create transition fails, it will not create the issue and will display the error you are receiving.
Caused by: com.atlassian.jira.exception.CreateException: Error occurred while creating issue through workflow`
Solution: To work around this error, you should review the workflows for the projects you are importing issues for inside the source instance, and remove any validators on the create transition before generating a new export to import from.
After successfully exporting and importing the projects, you can then re-add any validators you removed from workflows.