打开范例，出现如下错误:
Android NDK: jni/Android.mk: Cannot find module with tag 'CocosDenshion/android' in import path
Android NDK: Are you sure your NDK_MODULE_PATH variable is properly defined ?
Android NDK: The following directories were searched:
Android NDK:
jni/Android.mk:19: *** Android NDK: Aborting. . Stop.
怎么办？