look for error or mismatches

updated the script with a couple things

* look for the line with an actual error or mismatch (if you have warnings earlier in the file your cursor ends up there
* reformat the error message to give a cleaner output w/o the file name: !https://www.monosnap.com/image/QZSZN1wxUEH05rDzcALHJlIAyWYcl4.png!