Error while running the STSADM and PowerShell Commands

I was trying to work with solutions using STSADM command. But STSADM Commands was giving the error saying that "Object Reference not set to an instance of an object" as shown:

When I started the PowerShell it has given a error saying that "The Local Farm is not accessible. Cmdlets with FeatureDependencyId are not registered." as shown

On further investigation I found that some how my access on the SharePoint Config DB was removed. After giving the access this started working fine.