WRITETEXT in programs

Apart from the (real) possibility that they (PTC) didn't think that users would actually want to use WRITETEXT in a program (nothing in the help files indicates, let alone describes how, you could use it in a program):

I see no error (message) in the picture you provided. Please provide (also) a worksheet.

You only defined the 'check' variable in terms of a (little) program.

In order to actually execute the WRITETEXT function in that little program, it must be evaluated. Did you try evaluating check yet?

To evaluate check type:

check=

Success!
Luc