执行PowerShell脚本作为预构建事件失败

I have a pretty big JavaScript project I am working on, embedded into an ASP.NET MVC project. I have separated the JS code into several (12-ish) files, to have an easier handling of the code. The problem is, I have lost IntelliSense with this, and also, I need to link several of the files on the pages. There came the idea: let's make a PS script, to concatenate the files into one file. It works nicely, I give reference to that file only, so I have IntelliSense, and also, I only need to link that file into the page. However, I need to run the script every build manually. So the next idea was to set a pre-build event to run the script. And here comes the problem, the script doesn't run successfully.I have a pretty big JavaScript project I am wor