IgalleryX: Advanced Media Gallery

That is because you already install classpath to different version of PV3D so it conflicts with the version of this file. Just go to Edit – Preference – Actionscript – Actionscript 3 Setting and remove the classpath to other PV3D library

Open main.as file in com.rimv.aMediaGallery folder, In xmlLoaded() function, look for

insPane.visibleStatus = true;

and change to

insPane.visibleStatus = false;

Remember to compile the main FLA after making change (Ctrl + Enter)