Analysis office error, BI addin will disconnected

Dear Team,

Am getting the different error in Analysis office 1.4, saying An exception occurred and BI addin will be closed. and could not serialized the application model.

My BW system is 730 SP9 and Analysis office version is 1.4 am using.

Navigation is also taking long time , can some one please through some light on it.

Thanks

Venkata