Configuration name is not valid.
This error generally occurs when the name entered for the build configuration includes illegal characters, such as <, >, |, and *.
To correct this error
Check that the configuration name does not contain the following characters: <, >, *, |, :, \, /, &, %, ", ., #, ?, or a leading or trailing space. In addition, the configuration name cannot use names reserved for Windows or DOS, such as "nul", "aux", "con', "com#", "lpt#", and so on.
Re-type the name.