Problem: DataAccessException Occurred While Creating Entity Type 'EntityProperty'. This problem is described in Jira’s KB article, Project Import Fails Due to too Many Errors.
Solution: This article explains a workaround that would fix the exported data. Remember that this fix is quite complex, and this fix is explained for an XML backup. If you have exported with PC, the data.zip file will be found under the data folder in the exported zip. After changing it, the edited version must be compressed back into the same location in the exported zip.