Note to self: when you get an error “Parameter _reportName cannot be null or empty” then remember the post you found at http://axdax.blogspot.com/2013/11/parameter-reportname-cannot-be-null-or.html and let a full compile finish.

The blog mentions that you can compile the class referenced. But for me that just opened it up to another class, and another… so a compile of all classes did it for me.

Thanks to Sivert at axdax!

Happy DAXing!