in a Form on Delete operation via DELETE button 'SQL DELETE action' it deletes the row but throwing error as below

when checked in Debug it shows as below where i failed to find what actually is where actually is ‘no data found’ here… how one can find actual error where it occured? in above error screen when press OK it is showing same type error (as above) again with different id but seems same error ‘no_data_found’, when 2nd time press OK it is now showing Form, please help how i can find the actual error?
note: there is only one trigger which is ON INSERT OR UPDATE


regards