I tried to install the Blogga add on butI would see the this error, "not found. Please check that the block controller file contains the correct class name."

I already tried almost all of the solution I found through the forum search but still can't resolve the issue.

The package is in the root/package directory so the problem does not seems to be file location. Also, permission for the Blogga directory has been set to 777.

I have attached a screen caputre of the error.