The report definition for report 'path' has not been specified

So I guess you hit the error like it did, reports were working fine in your local project, but when uploaded to windows azure they stopped working.

The full errormessage is:
The report definition for report 'path' has not been specified. Could not find file 'path'.

This error might occur when you try to run a local report (rdlc).

The solution is to set the property "Build Action" of the rdlc to "Content". Now your installer will copy the physical rdlc.

you have to mark all .rdlc files in your project as Content.