Error Unable to log on to Microsoft Dynamic AX

the way i solve this problem are

1. make sure filled in the business connector proxy in System administration/Setup/System/System Service Account

2. check your AX configuration. 

both local client and business connector must have connected correct configuration with correct port. 

and also try to refresh WCF services for both.

Error _reportName cannot be null or empty.

if you encounter this kind of error

in this specific case it looks like an earlier full compile did not finish.

i would suggest you to first compile the class mentioned in the error message and see if it solves the problem.

1. go to AOS.
2. find classname mentioned in the error message.
3. compile it.