1.10 Beta D2 drop mod -- DOWNLOAD ME

when i try to use it it gives me an error saying the following:

Assertion Failure
Location : D2Common\DATATBLS\Datadbls.cpp, line #2243
Expression : Your data table is the wrong size -- do you have stale data?

it does this no matter what char i use new or old and if i use the short cut or not. Whats the deal?