TF error after updating Gazebo [closed]

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Hello!

I am using ROS Kinetic on Ubuntu 16.04. I had a running implementation of the navigation stack (amcl/gmapping) and I was performing the simulations using Gazebo 7. I upgraded to Gazebo 8 to add animated obstacles (humans/other robots) and ever since I did that, I am seeing the following error when I launch the AMCL launch file:

Timed out waiting for transform from base_link to map to become available before running costmap, tf error: . canTransform returned after 0.101 timeout was 0.1.

When I run 'rosrun tf view_frames', the resulting pdf shows 'no tf data received'. I am unsure what to do since everything was working perfectly until I updated Gazebo. Please help!