Microsoft Visual C Runtime Library in MS Excell

Can anyone help, I am getting the following error message

Microsoft Visual C++ Runtime Library
Assertion Failed!

Program:….
File:D:\work\trunk\c++\source\general\me…\rtpframe2.cpp
Line: 447

Expression: Length

For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts

(Press Retry to debug the application – JIT must be enabled)

Abort Retry Ignore

I cannot seem to fix the error.
Can anyone help