ndk-build eclipse argument: not find class

We are developing a system for Android devices. For that we are using FC16, Eclipse, SDK, NDK. In Eclipse: Run > External tool > External Tolls Configurations > we have the tabs: ``` [Main] Location: /usr/java/jdk1.7.0_02/bin/javah Working Directory: ${workspace_loc:/MyProject/bin} Arguments: -d ${workspace_loc:/MyProject/jni} com.myproject.MyActivity [Refresh] Specify Resources MyProject - JNI ``` Then when clicking on "Apply" and "Run" it comes the error message: ``` Error: Could not find class file for 'com.myproject.MyActivity'. ``` But, on the other hand if we go on terminal into the directory /MyProject and run the command: ``` ndk-build ``` No error appears, and the program runs as native C++ on Android. What is missing on Eclipse IDE? Should be something to do with the [Argment] as informed in [External Tolls Configurations], or is it something else we missed? All comments and suggestions are welcome and highly appreciated.