All error conditions
 202   can't open cache file [chkcache]
  12   http error
2181   no match for selector
  16   search string is empty!
  20   search term regular expression error
2749   sorry, access denied or file does not exist.
   2   syntax error [arg] in selector
   3   syntax error [no '/' in relpath] in selector
  19   syntax error [no '/'] in selector [pselect]
.