It just can't find a file or directory of TGUI as the error states. Make sure you got the full package of TGUI, which should include the form-builder, which is what seems to be missing or bits of it.
Does /home/dtscode/Desktop/TGUI-0.6-beta - GCC 4.7 TDM (SJLJ) - 32 bits/form-builder/tgui-form-builder exist or does it just contain a spelling mistake such as lower vs upper case one space too many etc.?