HDL UserDefinedTable issue

Hello,

I have created an hdl about the UserDefinedTable that i need to upload, but I get an error which I cannot understand:

COMMENT The user column instance is invalid. Enter a valid number.

COMMENT The value entered should match with the corresponding user column data type. The value must be numeric.

If the rows were numbers, then I would think that I did something wrong, but the DataType of that column is T (text), and those rows are filled with texts.

Do you have any Idea why this occurs?

Thank you,

Ioannis