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IDE won't start: java.lang.ClassNotFoundException: org.fife.ui.rsyntaxtextarea.TokenMap #8404

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OS: WindowsSpecific to the Windows version of the Arduino IDE
@per1234

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Using Arduino IDE 1.8.9 Hourly Build (current at this time) or Arduino IDE 1.9.0 Beta Build 97 Windows 10 64 bit

The Arduino IDE fails to start. arduino_debug.exe output:

Loading configuration...
Initializing packages...
Preparing boards...
java.lang.NoClassDefFoundError: org/fife/ui/rsyntaxtextarea/TokenMap
 at processing.app.syntax.PdeKeywords.<init>(PdeKeywords.java:69)
 at processing.app.Base.onBoardOrPortChange(Base.java:1320)
 at processing.app.Base11ドル.actionPerformed(Base.java:1514)
 at processing.app.Base.rebuildBoardsMenu(Base.java:1490)
 at processing.app.Base.<init>(Base.java:273)
 at processing.app.Base.main(Base.java:151)
Caused by: java.lang.ClassNotFoundException: org.fife.ui.rsyntaxtextarea.TokenMap
 at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
 ... 6 more

The issue does not occur with the ARM Linux Hourly Build of the Arduino IDE.

I suspect the problem is caused by: f15ddeb

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    OS: WindowsSpecific to the Windows version of the Arduino IDE

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