We can see BpmErrors on bg-ca.log with custom script

Document ID : KB000113416
Last Modified Date : 26/09/2018
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We can see BpmErrors on bg-ca.log when we define customer script as follows and run  the process.

Custom Script Properties:

User-added image

ERROR YYYY-MM-DD HH:MM:SS,SSS [Custom script execution pool-8-thread-1] utilities.BpmErrors

Begin Error Information:
  Step Action Id: 5014003
  Process Instance Id: 5001001
  Step Instance Id: 5001003
  Error: bpm.customScriptDone
  Error Code: bpm.customScriptDone
End Error Information

This is a defect and this is fixed on next version : 15:5.1.(DE42121).