Changing 32bit to 64bit

So, for a while i have been using Panda3D in Visual Studio no problem, yet for some reason after making a transition from 32 bit to 64 bit I get this error with the same code that work previously Exception thrown at 0x00007FFA2BE31639 (libp3framework.dll) in Panda3D.exe: 0xC0000005: Access violation reading location 0x00007FFA00000010.

What causes this?

Could you outline the steps you have taken? Did you download the 64-bit binaries from the website and change the paths as appropriate in the project settings?