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BMC Helix Remedyforce Service Desk
After the Salesforce Platform Upgrade on 13th February some customers are facing Apex error while updating Priority field on Incident in RF Console.
This is a known issue with Salesforce and they are working on it. Below is the link provided forr the same and you can check the status for the fix in the same link.
Link : https://success.salesforce.com/issues_view?id=a1p30000000jgkY
Now, for the workaround you need to disable the chatter from Remedyforce Administration. Below is the document for that: