18:36:32.545 [0004] W3001 : Error while executing plugin: HTTP/1.1 500 An unspecified error occurred which was caused by LoggedApplicationException: There was an error running the data mapping process caused by ApplicationException: Error executing DM configuration: The step is out of bound (DME000130) (DM1000031) (SRV000012) (SRV000001)
18:36:32.545 [0004] Execute Data Mapping: W1603 : Plugin failed - 18:36:32 (elapsed time: 00:00:00.793)
Looking at one of the error codes (DM1000031) suggests there is an issue trying to perform an extraction in the datamapper. I cannot tell is you are using a TEXT/CSV/PDF datamapper template. Try to validate the datamapper and your data file by clicking this button in the datamapper. It will tell you what record is giving you this error.
For this to work you will need to set the maximum record count in your datamapper