That's not from the servo pad skill. what other skills do you have? it's from something else.

DJ is correct - that error originates from a different robot skill. Can you list what other skills are being used?

It seems like the exception you're encountering is not directly related to the servo Pad Skill but might be coming from another robot skill in your project. To help you resolve this issue, could you please provide a list of all the robot skills you have added to your ARC project? This will help us identify which skill might be causing the exception.

Additionally, here are a few steps you can take to troubleshoot the issue:

1. Update ARC: Ensure you are using the latest version of ARC. Sometimes, updating to the latest version can resolve compatibility issues.

2. Check Skill Dependencies: Some robot skills might have dependencies on other skills or specific versions of ARC. Make sure all your skills are compatible with the version of ARC you are using.

3. Review Skill Configuration: Double-check the configuration of each skill to ensure they are set up correctly, especially after replacing the servos.

4. Isolate the Issue: Try disabling or removing skills one by one to see if the exception persists. This can help identify which skill is causing the problem.

5. Reinstall Skills: If you identify a specific skill causing the issue, try removing and reinstalling it.

Once you provide more information about the skills in your project, I can offer more targeted assistance.

Thank you for the quick response. I had a lot of skills installed in that project, so created a separate test project to help isolate the issue.

This new project has the Connection Skill, EZB v4 Info Skill, HBridge , PWM, HBridge , SetDigital , and servo Pad

But the error still happens when I click the ServoPad skill to move a servo. The HBridge and other skills seem to work fine.

Also, This configuration is also running on Parallels on my MacBook (which may be a contributor), since my Rock Pi configuration was running a little slow.

The RockPi configuration didn't have this error , but I will double check the ARC version

Thank you for your help.

Here is the error message: Version: 2025.01.30.00

System.MissingMethodException: Method not found: 'Jint.Engine ARC.Scripting.JavaScript.JavascriptEngine.get_JintEngine()'.
   at Servo_Script.ServoBindManager.Servo_OnServoMoveDetailed2(EZB ezb, ServoPositionItem[] servos, ServoPositionItem[] servosAfterFineTuned)
   at EZ_B.Servo.iW9mg2DKj8ZZfHLnnkdr(Object , Object , Object , Object )
   at EZ_B.Servo.SetServoPosition(ServoPositionItem[] servos)
   at ARC.EZBManager.SetServoPositionScalar(ServoDescriptor[] servos, Single inputMin, Single inputMax, Single input)
   at ARC.EZBManager.L8rQ7iJ6lxLkgMJojgqE(Object , Single inputMin, Single inputMax, Single input)
   at ARC.EZBManager.SetServoPositionScalar(ServoDescriptor[] servos, Int32 inputMin, Int32 inputMax, Int32 input)
   at ARC.UCForms.FormServoPad.vySlvXgqpJY(Object  , MouseEventArgs  )
   at System.Windows.Forms.Control.OnMouseMove(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseMove(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
ARC.UCForms.FormServoPad.vySlvXgqpJY(Object  , MouseEventArgs  )

Can you verify that these are the absolute only robot skills in your project that raise that error?

• Connection Skill
• EZB v4 Info Skill
• HBridge
• PWM
• HBridge
• SetDigital
• Servo Pad

None of these robot skills can raise that error. Please revisit your robot skill project and provide a list of robot skills. You can share the robot project by posting it here (Choose FILE and upload it to the editor) or by saving it to the public cloud and letting us know the name.

*Note: We edited your previous message to format the error correctly in a [ code ] quote.

Hello,  Here is the screen shot of the ServoPad project on Parallels with ARC 2025.01.30.00.

The version 2025 01.15.00 does not generate this error on my RockPi configuration.

Thank you for posting the image. However, the thumbnail shows there may have been other robot skills in the project. Can you please let us know what robot skills were in the project so we can identify a solution for you?

Hi @Athena,

Is there a way to rollback to a previous version of ARC?

Thank you for your help.