I am trying to find out if there is a character limit on the design table header for example "$configurations@xxxxxxxxxxxxxxxxxxxx<1>" .
I had some trouble with a few files today and once I reduced my file name characters, the error popping up saying the value was invalid went away
rename the length of the file, give a name as 000-000-000 or something numerical or alphanumerical code, it will be helpfull to your problem I think