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.
Errors arising from evaluation of the object you entered cannot be investigated from a nested break loop, because all breaks are disabled during such evaluation. If you wish to examine the error, click View 
Error Trace from the VLISP menu bar, or copy the expression to the Console prompt and press Enter