Autocommitted objects means that the system commits more then what you commit in the microflow. The system does this to keep the domain model in sync. This is something that you want to prevent. Have a look at this link where mendix explains more about autocommited objects. https://docs.mendix.com/refguide/committing-objects/#autocommit-and-associated-objects
Hai Raghavendra Bhagwat,
In your case please make sure whether you are committing main object which is used as reference for another object. Because if you are referencing one object to another that object should be present in DB. So that Mendix Runtime do the commit automatically and throw this error, if you didn’t commit it.
Please refer this Mendix docs to get clearance