Error: Unable to retrive

Hi, I have a problem with a show file.

When i try to load on Road Hog this error message apear:

"Unable to retrieve object for ID 51 from parameters array".

When i look for details: "Exception source callstack, desktop process, Main thread:"

And then, road hog are freeze.

Is an important show with a lot of hours of works.

We don´t remember with wich version is do it, we try open it with last versions.

What is the problem? Can do anything?

Thanks