I can get that message when using DMG Equilibrium(also a fancy EQ) with the VST3 version(32 and 64bit) of it. The VST2 version works fine.
Now how it happens: All versions of the VST mentioned do work(open the EQ for settings and plays music), music stops and that message pops up only when going to the next song with a different sample rate(using vst3). And if I press play, foobar starts the next song just fine and keeps going until the next sample rate change.
All the other VSTs I tried so far would either work fine or not work at all, only Equilibrium behaved like I described so I thought it might not be all that obvious to diagnose and decided to share this in case it's of any help.