Gmax error reads...

A friend sent me a very complex model in Gmax when I open it and try to manipulate it I get an Assertion Failed error message that reads...
In file:'..\MaxSDK\Include|tab.h'
Line:117
Anyone know whats up with this one?
In file:'..\MaxSDK\Include|tab.h'
Line:117
Anyone know whats up with this one?