Getting the Error in IFSCommandPLSql Unexpected error while calling server method AccessPlsql/Invoke ORA-20115:The ":UL" has already been removed by another user.

I am getting the error “Error in IFSCommandPLSql Unexpected error while calling server method AccessPlsql/Invoke ORA-20115:The ":UL" has already been removed by another user.” when trying to upload files using 3rd party tool integrated to applicant function in IFS application) . NLS_LANG is set to AMERICAN_AMERICA.AL32UTF8. customer is using French in IFS application. Can some one assist to resolve this issue ?