What are the keywords to avoid

Some of the perchance image generators are hit and miss. I noted I got a line33 and line34 errors. It doesn't really explain what they are. I removed lots of text and stripped back to a basic script and still get them.

Is there a way of either I like X, do more of X or X better but don't do Y, forget Y. Also is there a picture morphing you can slide one to another?