this is expected and known due to the latest changes in Joomla 3.6.1
You have to install the latest package of Responsivizer 2.4.1 in order to mantain compatibility with the latest Joomla version.
To update the component download and install normally the package through the Joomla Extensions Manager.
If your license has expired you should have received the special coupon code for license renewal to get discount, if you have missed the coupon code for renewals license contact me at
to receive it.