I have a mapping in IICS that ran perfectly during my tests. However, after I scheduled it, I am suddenly getting this error message: The following error occurred before the task was run on the runtime environment: [Operation failed: null.;Operation failed: null.]. I don't know why. I tested my connection for the source and it tested successfully. I even clicked Preview Data for my source and it pulled up sample data from the file. I have several connected lookups in my mapping to check for existing records. All lookups are looking at the Contact Object in Salesforce. I tried changing my connector for my source to a different flat file connection, and I still get the same error message. The connection is not a REST API (at least not that I am aware of). How can I get this to run again?
this error usually coming when the selected object in Source is missing some fields.
Try to validate and test again.