Error: Bad Request The CSRF token could not be verified

Error: Bad Request The CSRF token could not be verified

Just got the above error while submitting a form in my Yii powered SaaS app. I realized that the form isn't generated by Yii, but was customized. Hence I had to add a hidden field:

echo CHtml::hiddenField('YII_CSRF_TOKEN',Yii::app()->request->csrfToken);

Thanks to http://www.techportal.co.za/yii-framework/219-getting-error-bad-request-the-csrf-token-could-not-be-verified-when-csrf-has-been-enabled-in-the-yii-framework-

/sbin/mount.vboxsf: mounting failed with the error: No such device

I had been searching for the solution for:

/sbin/mount.vboxsf: mounting failed with the error: No such device

... and apparently there's a difference between:

apt-get install build-essential linux-headers-`uname -r` and

apt-get install build-essential linux-header-`uname -r`

The former saved me from the error.

In case you'll encounter another error with the word "protocol", just change the folder name in the edit share sectio of the virtualbox, then try the mount command again and you're good to experience relief.