In text editor windows it is not possible to inspect selected expressions longer than 256 characters. If you select a string longer than 256 characters, you will be prompted to enter an object name.
If you specify an object or expression that VLISP cannot evaluate, VLISP issues a standard AutoLISP error message. Once the error message appears, you can correct the expression in the dialog box and try to evaluate it once more.
Error Trace from the VLISP menu, or
copy the expression to the Console prompt and press ENTER.