remove fixture from sequence can no longer edit it

[perrip]

Hello, I am hoping someone can help or tell me what I am doing wrong. I decided to upgrade some lights. I removed the old ones from the location file, via add remove fixtures. When I go to open any sequence that they were in to program in the new lights in, I get a "subset out of range error" and it will not let me open the sequence in the sequence editor. the new lights have completely different addresses than the ones I removed. If I just add the lights and keep the ones I am no longer using in the location file, I can edit the sequence and add the new lights in, Can someone tell me if I am doing something wrong? I am using 4.1.7 thinking I am missing something obvious.
Thanks!
Paul

[perrip]

oops I meant "subscript out of range"