SQL Sever cannot open the Link dialog box, and the object reference is not set to an instance of the object. (Appidpackage)

Yesterday just finished the system, first installed SQL Sever2008, loaded after also tried, ok~ no problem, and then continue to install VS2012 and other software. Did not continue to try to sleep late, the next day to run SSMs problem.

SSMs runs the " Cannot open Link dialog box, the object reference is not set to an instance of the object." (appidpackage)", what's the situation ~ Baidu has not found a solution for a long time. Then open SQL Sever Configuration Manager to discover that the SQL Sever service is " Remote procedure call failed ."

It seems to be true that the installation vs conflict caused, open programs and features remove Microsoft SQL Server Express LocalDB, and then open the SQL Sever service for Configuration Manager, the problem is resolved, but re-open SSMs still appears " object references are not set to an instance of an object. (appidpackage)", there seems to be other problems.

Open Connection Object Explorer in the SSMs file, as shown in the following scenario.

The error is the. NET Framework, which is the exception that occurs in the application's components, the details inside a bunch of exception text, regardless of it, click Continue! Finally, the connection window pops up!

First of all, no matter 3,721, connected to say ... Oh, the problem comes again.

See the message that it pops up, knowing that the configuration system failed to initialize and that the configuration node (System) could not be recognized. Configuration), (C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config line 136), it seems that the problem is here, Open Machine.config to find the problem line, from the same directory machine.config.comments recovery, run SSMs again problem does not appear, smooth landing ~

SQL Sever cannot open the Link dialog box, and the object reference is not set to an instance of the object. (Appidpackage)