Element has encountered an unrecoverable error.

Update your graphics driver and configure it in a way to be compatible with E3D.

Mylenium

The instructions are very clear - contact Videcopilot. 

If you want any educated responses here, you need to provide a lot more info:  hardware specs inc GPU, OS version, AE version, Element version etc.  When does the error occur, when you apply the effect?  When you import an object?