Hi ,
I am facing two important problems. how to solve it.

Ruby :
Success
Ruby Runtime Plugin
Failure -
java.io.IOException: Failed to dynamically deploy this plugin
at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1895)
at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1652)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:110)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: Unable to delete 'C:\Program Files (x86)\Jenkins\plugins\ruby-runtime'. Tried 3 times (of a maximum of 3) waiting 0.1 sec between attempts.
at hudson.Util.deleteRecursive(Util.java:346)
at hudson.ClassicPluginStrategy.explode(ClassicPluginStrategy.java:604)
at hudson.ClassicPluginStrategy.createPluginWrapper(ClassicPluginStrategy.java:167)
at hudson.PluginManager.dynamicLoad(PluginManager.java:847)
at hudson.PluginManager.dynamicLoad(PluginManager.java:813)
at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1891)
... 5 more
Caused by: java.nio.file.FileSystemException: C:\Program Files (x86)\Jenkins\plugins\ruby-runtime\WEB-INF\lib\classes.jar: The process cannot access the file because it is being used by another process.

at sun.nio.fs.WindowsException.translateToIOException(Unknown Source)
at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
at sun.nio.fs.WindowsFileSystemProvider.implDelete(Unknown Source)
at sun.nio.fs.AbstractFileSystemProvider.deleteIfExists(Unknown Source)
at java.nio.file.Files.deleteIfExists(Unknown Source)
at hudson.Util.tryOnceDeleteFile(Util.java:287)
at hudson.Util.tryOnceDeleteRecursive(Util.java:364)
at hudson.Util.tryOnceDeleteContentsRecursive(Util.java:383)
at hudson.Util.tryOnceDeleteRecursive(Util.java:363)
at hudson.Util.tryOnceDeleteContentsRecursive(Util.java:383)
at hudson.Util.tryOnceDeleteRecursive(Util.java:363)
at hudson.Util.tryOnceDeleteContentsRecursive(Util.java:383)
at hudson.Util.tryOnceDeleteRecursive(Util.java:363)
at hudson.Util.deleteRecursive(Util.java:341)
... 10 more
Git Lab

Gitlab Hook Plugin
Failure -
java.io.IOException: Failed to dynamically deploy this plugin
at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1895)
at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1652)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:110)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: Unable to delete 'C:\Program Files (x86)\Jenkins\plugins\gitlab-hook'. Tried 3 times (of a maximum of 3) waiting 0.1 sec between attempts.
at hudson.Util.deleteRecursive(Util.java:346)
at hudson.ClassicPluginStrategy.explode(ClassicPluginStrategy.java:604)
at hudson.ClassicPluginStrategy.createPluginWrapper(ClassicPluginStrategy.java:167)
at hudson.PluginManager.dynamicLoad(PluginManager.java:847)
at hudson.PluginManager.dynamicLoad(PluginManager.java:813)
at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1891)
... 5 more
Caused by: java.nio.file.FileSystemException: C:\Program Files (x86)\Jenkins\plugins\gitlab-hook\WEB-INF\lib\classes.jar: The process cannot access the file because it is being used by another process.

at sun.nio.fs.WindowsException.translateToIOException(Unknown Source)
at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
at sun.nio.fs.WindowsFileSystemProvider.implDelete(Unknown Source)
at sun.nio.fs.AbstractFileSystemProvider.deleteIfExists(Unknown Source)
at java.nio.file.Files.deleteIfExists(Unknown Source)
at hudson.Util.tryOnceDeleteFile(Util.java:287)
at hudson.Util.tryOnceDeleteRecursive(Util.java:364)
at hudson.Util.tryOnceDeleteContentsRecursive(Util.java:383)
at hudson.Util.tryOnceDeleteRecursive(Util.java:363)
at hudson.Util.tryOnceDeleteContentsRecursive(Util.java:383)
at hudson.Util.tryOnceDeleteRecursive(Util.java:363)
at hudson.Util.tryOnceDeleteContentsRecursive(Util.java:383)
at hudson.Util.tryOnceDeleteRecursive(Util.java:363)
at hudson.Util.deleteRecursive(Util.java:341)
... 10 more
Thanks
Prasad