Internet Explorer Script Error is a cryptic error message that you may encounter. The main issue with it is that it provides no information about the actual cause of the problem. The secrecy is not a bug, but a feature that protects your site from malicious attacks. You might encounter this error when you see a problem executing a command that involves an application attempting to access a web-based feature. Applications such as Java, Flash, ActiveX, etc. interacting with QuickBooks Online or Desktop can cause this error.