How cam diadem check if channel exist before loading channel with DataFileLoadSel

Dear,

My problem is simple. I my code I use DataFileLoadSel(..,...,..., "register") to load selectively channels from tdms file. However, from one file to another the channel I want to load amy exist or not. How can I check this. In fact, if the channel does not exist then it generates an error message and my program ends.

Thank you for your help,

Best regards,

Louval