Hi all, I tried juggling the remaining letters. Nearest to anything meaningful I can get is 'Only the true see error', except that is with an extra 'o' so, as djawhufc says, the puzzle revolves around two interpretations of the three- word phrase.
That's it done then! I wanted more to do!
Thought I was missing something or had wrong letters when I noticed 'ERR' a couple of times but could see nothing else relevant!!