Unable to add or edit account and bill rule in 10.6 builds

Unable to add or edit account and bill rule in 10.6 builds

Error Trace

[09:46:20:508]|[04-28-2022]|[SYSERR]|[INFO]|[47]: Caused by: org.json.JSONException: JSONObject["udf_fields"] not found.|

Fix

* Stop Servicedeskplus-msp service.

* Navigate to \ManageEngine\ServiceDeskPlus-MSP\conf\entity_conf  and take a backup of  udf_field.json 

* Delete udf_field.json and restart the application service and check if the issue is resolved.