Hi All,   I wrote a test plugin which is using 'GstBaseTransform' as base class. I am able to compile it and .so is generated successfully. But gst-inspect-0.10 command is unable to load it and getting the following error : ---------- gstregistry.c:876:gst_registry_scan_path_level:<registry0>[00m file /usr/lib/gstreamer-0.10/libplugin-test.so not yet in registry ...  GST_PLUGIN_LOADING gstplugin.c:392:gst_plugin_load_file:[00m attempt to load plugin "/usr/lib/gstreamer- 0.10/libplugin-test.so" 0:00:00.405458000 [332m 3115[00m 0x8d36968 [33;01mWARN [00m [00;01;36m  GST_PLUGIN_LOADING gstplugin.c:414:gst_plugin_load_file:[00m module_open failed: /usr/lib/gstreamer-0.10/libplugin-test.so : undefined symbol: gst_base_transform_get_type --------- Can someone point out the cause of this problem? do I need to include something in my code? Thanks in advance. Regards, Sanjay Thanks & Regards, Sanjay