Why i get this Error ?

when i open model from inv. 2013 fusion in inv. 2011 i am geting this error and i can work later on modeling more on model i started :( please some help info

1 Answer

Inventor files are not backward compatible. The only way to open IV 2013 files in a IV 2011 system is to export the IV 2013 files to a neutral format and import them into IV 2011