All error conditions
 256   can't open cache file [chkcache]
  70   can't open file
   8   http error
2299   no match for selector
  12   search string is empty!
  18   search term regular expression error
2715   sorry, access denied or file does not exist.
   1   syntax error [arg] in selector
   2   syntax error [no '/' in relpath] in selector
  30   syntax error [no '/'] in selector [pselect]
.