Unity 5 and missing method exception

[fireside]

I just switched to Unity 5.  I updated Playmaker, but I still get this error and no script or line number, but when I double click on it, it seems to lead to a Playmaker script in the editor:
MissingMethodException: Method not found: 'UnityEngine.Component.get_guiTexture'.

[Alex Chouls]

Checkout the Troubleshooting guide here:
https://hutonggames.fogbugz.com/default.asp?W624