Cannot ger a NUMERIC value from a STRING cell

This error message usually occurs when you are trying to perform a mathematical operation on a cell that contains text instead of a number. To fix this, you need to convert the text in the cell to a numeric value.

You can do this by using the `VALUE` function in Excel. For example, if cell A1 contains the text "10", you can convert it to a number by using the formula `=VALUE(A1)`. This will return the numeric value 10.

Alternatively, you can try changing the format of the cell to a number format. Right-click on the cell and select "Format Cells". Then, choose "Number" from the list of categories and select the appropriate number format.

If neither of these solutions work, it is possible that there are hidden characters or spaces in the cell that are causing the error. In this case, try copying the cell contents to a new cell and see if the error persists.