Question: Maple 2023 Strange error

 Hello guys, in the attached code I get the following error  "Error, unsupported type of index, t", which seems to be a bug in Maple 2023 (the reason is I didn't get this error in Maple 2022) , you can see the 

so does anyone have a solution here?

Update 1: I Figured out My mistake

the problem was because of declaration of "R" as a variable and at the same time I declare it as a noncommutative physics object so i just change the name of variable to something else and it fixed 
sorry for any disturb

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