Blender Textures keep turning pink?

well I’ve had this problem for a while now where my textures keep turning pink, i have no idea how to fix this and it is quite annoying. this has happened more then once when i have imported a minecraft world into blender. when i save the blend. file and then close it everything turns pink for some odd reason?

Before i close:

After i close and restart blender:

I am not moving the textures or the blend files, so that is not the problem.

i will post the blend. file if asked

no not yet i will try that thanks.