Can't open file in Revit architecture 2012!

[Pracx12]

I had to work in Revit architect 2012 and today i have to open this file again. The program is show message is

Autodesk Revit Architect 2012

Buil : 20110916_2132(x64)

License unavailable. A license is required to run Autodesk Revit Architect 2012 on this computer.

But this file i have to tried to open in another machine is can open. Do i need to recovery my Revit program or re-install.

Many thanks.

[Anonymous]

t's telling oyu that you do not have a license available to run it.  Did you have a crash or something?..You'll need to repair/reinstall and then request/update youur license.

M