I get this error only when i come to search from dashboard. If run the search independently I don't get this error.
Getting Error - Unknown "Sid", The search job "admin_admin_Y29ydmlsX3NlY3VyaXR5X2FuYWx5dGljcw_search1_1505452955.8" was canceled remotely or expired.
hi - check this older discussion out
https://answers.splunk.com/answers/107674/unknown-sid-error-when-doing-multiple-searches.html