Compiling error: AndroidJavaClass and AndroidJavaObject problems

Hi,

I'm working on a project which already works (vuforia project), but when I try to import a package from another project (from gyrodroid project) to add some scene objects and cameras, it gives me these two errors:

Assets/Qualcomm Augmented Reality/Scripts/Internal/AndroidUnityPlayer.cs(80,30): error CS1061: Type AndroidJavaObject' does not contain a definition for Dispose' and no extension method Dispose' of type AndroidJavaObject' could be found (are you missing a using directive or an assembly reference?)

Assets/Qualcomm Augmented Reality/Scripts/Internal/AndroidUnityPlayer.cs(83,37): error CS1061: Type AndroidJavaClass' does not contain a definition for Dispose' and no extension method Dispose' of type AndroidJavaClass' could be found (are you missing a using directive or an assembly reference?)

Could you guys please help me a little bit with this?

Thank you