I have re-named them but it's coming up with the exact same error message. Just with the names changed.

My first textbox is now called 'self1'. The second one is called 'self2'.

the third one displaying the result is called 'result'.

I noticed after my textbox name in my expression 'value' was not an option in the drop down list brought up by intellisense.

This is my expression:-

=ReportItems.self1.Value + ReportItems.self2.Value

There is a red line under the first ReportItems saying wrong number of arguments