Alexejhero
commented
2 years ago I was mistaken, the exception reported above might have been an induced error. I've located another exception which happened before the first one which makes a bit more sense.
java.lang.NoSuchMethodError: No virtual method createWebcam(Lorg/firstinspires/ftc/robotcore/external/hardware/camera/WebcamName;)Lorg/openftc/easyopencv/OpenCvCamera; in class Lorg/openftc/easyopencv/OpenCvCameraFactory; or its super classes (declaration of 'org.openftc.easyopencv.OpenCvCameraFactory' appears in /storage/emulated/0/FIRST/ExternalLibraries/EasyOpenCV_v1_5_1_OBJ_bundle_aar/dex/classes.dex)
at org.firstinspires.ftc.teamcode.auto.MainAuto.opmode_run(MainAuto.java:43)
at org.firstinspires.ftc.teamcode.common.opmodes.HtechLinearOpMode$LinearOpModeHelper$1.run(HtechLinearOpMode.java:263)
at com.qualcomm.robotcore.util.ThreadPool.logThreadLifeCycle(ThreadPool.java:737)
at org.firstinspires.ftc.teamcode.common.opmodes.HtechLinearOpMode$LinearOpModeHelper.run(HtechLinearOpMode.java:258)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at com.qualcomm.robotcore.util.ThreadPool$ThreadFactoryImpl$1.run(ThreadPool.java:793)
at java.lang.Thread.run(Thread.java:761)
Windwoes
Hello, I haven't been here in a while.
I'm installing EasyOpenCV on SDK 1.7.1 with a fully up-to-date Control Hub. I added the external library through OnBotJava, as the guide said. Building works both via the web and via ftc_http, but when running the code I get the following exception, and the robot controller crashes:
Outdated, see comment below
``` java.lang.ClassNotFoundException: com.qualcomm.robotcore.wifi.WifiDirectAssistant$1 at java.lang.Class.classForName(Native Method) at java.lang.Class.forName(Class.java:400) at org.firstinspires.ftc.robotcore.internal.opmode.ClassManager.classNamesToClasses(ClassManager.java:214) at org.firstinspires.ftc.robotcore.internal.opmode.ClassManager.processAllClasses(ClassManager.java:257) at com.qualcomm.ftccommon.ClassManagerFactory.processAllClasses(ClassManagerFactory.java:94) at org.firstinspires.ftc.robotcontroller.internal.FtcRobotControllerActivity.onCreate(FtcRobotControllerActivity.java:356) at android.app.Activity.performCreate(Activity.java:6709) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2619) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2727) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6121) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:795) ``` The error is thrown by the `createWebcam` function on the 3rd line below. The first two lines run without error. ```cs OpenCvCameraFactory factory = OpenCvCameraFactory.getInstance(); WebcamName camera = hardwareMap.get(WebcamName.class, "Webcam 1"); OpenCvCamera ocvCam = factory.createWebcam(camera); ```I've already removed the old .so file from the control hub, added the new one and replaced the robot controller application with the original one.