Command jdk.java.project.resolveProjectProblems' not found

[Achal1607]

I tried to run this repo : https://github.com/admpresales/testng-example. But it resulted in this error.

Steps to reproduce:

1. git clone https://github.com/admpresales/testng-example
2. open any file it would show it has some classpath problems
3. When you click on light bulb it would provide option to resolve problems
4. When you click on that error dialog appear.

[Achal1607]

PR raised: https://github.com/apache/netbeans/pull/7370