Symptom

When attempting attempting to run Jobs on a JAMS Agent whose version is older than the JAMS Server (E.g. a JAMS V7.0.1329 Server running Jobs on a JAMS V7.0.1287 Agent), users may encounter the following error: 

" JSON syntax error, expected '{', '}', or comma "

Cause

This happens if enhancements were added to the Execution Method between versions. If the Server is upgraded to the enhanced version and the Agent is not, there is no way for the older Agent version to know what the Execution Method enhancements on the Server are. When the Agent cannot evaluate a field, it throws the JSON syntax error.

Resolution

Upgrade the Agent to the current JAMS Server Version.