use of commas

In the statement “Guilty as charged, but no longer”, I was told, by a friend that happens to be a technical writer, that the use of a comma is incorrect. According to “Rules for Comma Usage”,"one should “use commas to set off phrases that express contrast”. Example: The puppies were cute, but very messy. Why is my comma incorrect? Thanks Tom

No need to start the exact same topic in two threats, Thomas.

In this forum “English Vocabulary, Grammar and Idioms” you will have your grammar-related question answered quite quickly in general.

Check those links of this site regarding comma usage:

Another link to comma use explanation:

Good luck.