getting error already have slur in my compilation

[Sarah k Alawami]

Hello there. I've never seen this before. I got "already have slur" I checked and all looks well but this is an odd one.

Here is the .ly file. I got rid of all the bar checks except for a few that looked correct. did I miss something? again?

final score.ly
Description: Binary data

I hope one day I can know enough to help out as well. but for now I'm taking baby steps lol!

Take care all and be blessed.

Sarah Alawami.

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