start up error R2020b

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)

>>

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/488382-switchng-folder-to-desktop-in-catalina-10-15

Answer 1

[Image Analyst]

See the FAQ: During_installation.2C_the_installer_crashes.2C_hangs.2C_gives_an_error_message.2C_does_not_authenticate_your_license.2C_or_otherwise_does_finish_installing_correctly?

It's your fastest route to success.

Answer 2

[Chiedozie Ogueri]

https://www.youtube.com/watch?v=h7gEMcfeLB8

[Rik]

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.