start up error R2020b

25 次查看（过去 30 天）
Ashlee Falls
Ashlee Falls 2020-10-21
编辑： Walter Roberson 2023-9-21
When starting up MatLab, I get the following error. It will not let me run anything anymore. I've tried removing the software completely and redownloading it, but that did not work. Please help!
Exception in thread "ContributedToolsLoader": java.lang.NoClassDefFoundError: Could not initialize class java.nio.file.FileSystems$DefaultFileSystemHolder
at java.nio.file.FileSystems.getDefault(FileSystems.java:176)
at java.io.File.toPath(File.java:2234)
at com.mathworks.resources_folder.ResourcesFolderUtils.getResourcesFolderName(ResourcesFolderUtils.java:31)
at com.mathworks.mde.desk.ContributedTools.constructToolSetFileName(ContributedTools.java:103)
at com.mathworks.mde.desk.ContributedTools.<init>(ContributedTools.java:65)
at com.mathworks.mde.desk.ContributedToolsLoader$3.run(ContributedToolsLoader.java:69)
at java.lang.Thread.run(Thread.java:748)
Exception in thread "Startup Class Loader": java.lang.NoClassDefFoundError: Could not initialize class com.mathworks.instutil.InstutilResourceKeys
at com.mathworks.mlwidgets.help.DocCenterRoot.initDocRelease(DocCenterRoot.java:44)
at com.mathworks.mlwidgets.help.DocCenterRoot.<clinit>(DocCenterRoot.java:26)
at com.mathworks.mlwidgets.help.HelpPrefs.<clinit>(HelpPrefs.java:57)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.mathworks.mlservices.MLHelpServices.getDocRoot(MLHelpServices.java:522)
at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.getDocrootDirectory(ProductInfoUtils.java:707)
at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.getAbsolutePath(ProductInfoUtils.java:694)
at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.parseFile(ProductInfoUtils.java:259)
at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.parseFiles(ProductInfoUtils.java:319)
at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.pathChanged(ProductInfoUtils.java:154)
at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.<init>(ProductInfoUtils.java:80)
at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.getAllProductsInfo(ProductInfoUtils.java:900)
at com.mathworks.mlwidgets.util.productinfo.ProductInfoUtils.<clinit>(ProductInfoUtils.java:66)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.mathworks.mde.desk.StartupClassLoader$LoadInfo.<init>(StartupClassLoader.java:112)
at com.mathworks.mde.desk.StartupClassLoader.createLoadInfos(StartupClassLoader.java:202)
at com.mathworks.mde.desk.StartupClassLoader.access$500(StartupClassLoader.java:25)
at com.mathworks.mde.desk.StartupClassLoader$2.run(StartupClassLoader.java:223)
at java.lang.Thread.run(Thread.java:748)
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回答（2 个）

Image Analyst
Image Analyst 2020-10-21
Chiedozie Ogueri
Chiedozie Ogueri 2020-12-11
https://www.youtube.com/watch?v=h7gEMcfeLB8
  1 个评论
Rik
Rik 2020-12-11
While this isn't spam (it was initially marked as such), it makes much more sense to post this as a guide here, instead of a link to a video.

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