[phenixbb] FASTA format for sequence file

Hello, I'm trying to run Phase-MR on Phenix (older version) and having trouble formatting my sequence properly. I keep getting error "Protein Sequence not recognized in Composition". I have a good idea of what FASTA should look like (carrot with a name, no spaces or weird characters, followed by the sequence in all capital letter on the next line). I have tried many things, mainly using gedit and plain text files (.txt). I've made sure the file name doesn't have any strange characters as well. If I cut and paste a FASTA file from the PDB into gedit, save that at a .txt, Phaser accepts it. If I cut and paste my protein sequence into the same file, it rejects it. Suggestions?