Save for web export crashing photoshop

HI

In was wondering if anyone could help me.  I have written a code that edits images but i am having trouble with the save for web export everytime it gets to saving it photoshop just crashes. I have tried a few different ways of coding it but all of them end of crashing PS and i am at a loss as to what is wrong.

Here is the code that i am using:

                                        setwebFolderto (choose folderwith prompt "Select the folder to link to")

                                        setwebOptto {class:save for web export options, web format:JPEG, quality:89}

                                        settheDoctocurrent document

  exporttheDocinwebFolderassave for webwith optionswebOpt

any help would be great. I have tried it on CS6 and CC, both of which crash.