# Processing 4 not working in Python mode with Windows 10
**URL:** https://discourse.processing.org/t/processing-4-not-working-in-python-mode-with-windows-10/35253
**Category:** Processing.py
**Created:** [February 17, 2022, 7:51pm UTC](https://discourse.processing.org/t/processing-4-not-working-in-python-mode-with-windows-10/35253 "2022-02-17T19:51:41Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@fransua](https://discourse.processing.org/u/fransua)
#### Post date: [February 17, 2022, 7:51pm UTC](https://discourse.processing.org/t/processing-4-not-working-in-python-mode-with-windows-10/35253/1 "2022-02-17T19:51:41Z")
Python mode for Processing 4 installed correctly.
Execution mode with simple instruction gives :
```auto
Exception in thread "AWT-EventQueue-0" java.lang.NoSuchMethodError: 'java.lang.String processing.app.Sketch.getMainProgram()'
at jycessing.mode.run.PdeSketch.(PdeSketch.java:55)
at jycessing.mode.PyEditor.runSketch(PyEditor.java:348)
at jycessing.mode.PyEditor.handleRun(PyEditor.java:369)
at jycessing.mode.PyToolbar.handleRun(PyToolbar.java:22)
at processing.app.ui.EditorToolbar$1.actionPerformed(EditorToolbar.java:135)
at processing.app.ui.EditorButton.mousePressed(EditorButton.java:191)
at java.desktop/java.awt.Component.processMouseEvent(Component.java:6623)
at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3389)
at java.desktop/java.awt.Component.processEvent(Component.java:6391)
at java.desktop/java.awt.Container.processEvent(Container.java:2266)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5001)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2324)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4833)
at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4948)
at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4572)
at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4516)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2310)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2780)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4833)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:722)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:716)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:97)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:746)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:744)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:743)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
```
---
### Author:  [@tabreturn](https://discourse.processing.org/u/tabreturn)
#### Post date: [February 17, 2022, 8:11pm UTC](https://discourse.processing.org/t/processing-4-not-working-in-python-mode-with-windows-10/35253/2 "2022-02-17T20:11:03Z")
Welcome @fransua
Are you using Processing 4.0 beta 6? I’m aware there’s a Python Mode issue with this release. Have you tried [Processing 4.0 beta 5](https://github.com/processing/processing4/releases/tag/processing-1280-4.0b5)?
(If that solves the problem, there’s likely a fix coming in beta 7)
---
### Author:  [@danelyn](https://discourse.processing.org/u/danelyn)
#### Post date: [March 4, 2022, 6:27pm UTC](https://discourse.processing.org/t/processing-4-not-working-in-python-mode-with-windows-10/35253/3 "2022-03-04T18:27:34Z")
seconding this, was having this exact same error and will return back once I install previous version
---
### Author:  [@tabreturn](https://discourse.processing.org/u/tabreturn)
#### Post date: [March 4, 2022, 8:07pm UTC](https://discourse.processing.org/t/processing-4-not-working-in-python-mode-with-windows-10/35253/4 "2022-03-04T20:07:04Z")
[Processing 4.0 beta 7 has just released](https://github.com/processing/processing4/releases/tag/processing-1282-4.0b7), which rolls back the change that broke Python Mode in 4.0b6.