Hi @Yuri Azov ,
Good day! Welcome to Q&A forum.
A formula has a spelling mistake or refers to a column that does not exist which indicates that the column name is not correct.
Here is an example about how to set up a formula to calculate the average between multiple columns:
Create some “Number (1,1.0,100)” column: number1, number2, number3
Create a calculated column named cal with the following formula: =AVERAGE([number1],[number2],[number3]), and data type choose “Number (1,1.0,100)”:
Hope these information helps.
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