500 Inernal Error when attemptimg to import

While trying to import a company csv file, encountered a 500 Internal Error.

The plugin was deactivated and re-installed and the import executed again with the same results.

The server error log entries, before and after the reinstall are below as well, the text from the 500 error.

20170116T164406: drivehardautobrokerage.com/wp-admin/admin.php
PHP Fatal error: Call to undefined function erp_hr_get_departments_dropdown_raw() in /hermes/bosnaweb20a/b287/ipg.moonlighthummingbird/drivehard/wp-content/plugins/erp/includes/functions.php on line 1271

After delete and reinstall:

20170116T164406: drivehardautobrokerage.com/wp-admin/admin.php
PHP Fatal error: Call to undefined function erp_hr_get_departments_dropdown_raw() in /hermes/bosnaweb20a/b287/ipg.moonlighthummingbird/drivehard/wp-content/plugins/erp/includes/functions.php on line 1271

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.

Your assistance in resolving this error is greatly appreciated.

~Respect