Object reference not set to an instance of an object. The Solution installation failed

I was getting error "Object reference not set to an instance of an object. The Solution installation failed" while adding and deploying my solution package from STSADM command, I have looked into my event log and SharePoint log to find out the exact error, I have found out that it’s related to Admin Content SQL database.  The current user who is executing the STSADM command must have full control access to this content database.

Then I run my solution package with service account and it ran well without any problem, here we can also add current user into content database and will give full control rights to current user to executing solution package.

Good Luck!

Access denied error while installing feature

I was getting “Access denied” in command prompt when I tried to execute below command

Stsadm –o installfeature –name “featurename” –force

Solution:

1. Log in user was not added into Central Admin Database security group into SQL Server.

2. Log in user has to be in farm administrator/site collection users group in SharePoint site.

By adding my current Log in users into above two parts, I was able to successfully install feature.