# Java Script error 800A03F6
**URL:** https://discussions.unity.com/t/java-script-error-800a03f6/97258
**Category:** Questions & Answers
**Created:** [February 24, 2014, 11:43pm UTC](https://discussions.unity.com/t/java-script-error-800a03f6/97258 "2014-02-24T23:43:35Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@GSkalsky](https://discussions.unity.com/u/GSkalsky)
#### Post date: [February 24, 2014, 11:43pm UTC](https://discussions.unity.com/t/java-script-error-800a03f6/97258/1 "2014-02-24T23:43:35Z")
I am getting a 800A03F6 error every time I try to open up any script. Even a brand new one? It says line 1 char 4 invalid character. Any Ideas?
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### Author:  [@WikiMalik](https://discussions.unity.com/u/WikiMalik)
#### Post date: [September 25, 2015, 7:57am UTC](https://discussions.unity.com/t/java-script-error-800a03f6/97258/2 "2015-09-25T07:57:47Z")
The error message you get comes from a microsoft tool called ScriptHost. This has nothing whatsoever to do with Unity… It probably means that you have files with a .js file extension associated with that MS tool. Usually you’d create a JavaScript file from inside the Unity editor. When you edit it that file from Unity you should get a tool called MonoDevelop open which will allow you to edit the JavaScript. Instead you’re getting the Windows ScriptHost, which is trying to execute the code, and is complaining about the # character. If you are trying to edit JS files from outside Unity, try using Right-Click Open With instead of double clicking. Perhaps choose either MonoDevelop or Notepad.