Question: mod to mods

Question:mod to mods

Maple
Greetings, Can someone please tell me why I am seeing this error. Thank you, > `mod` := mods; Error, invalid mod `mod`Typesetting:-mambiguous( Assign modssemi, Typesetting:-merror( "invalid mod", foreground = "[255,0,0]", mathvariant = "normal"))
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