Studio 6.4 gradle wrapper error when creating a new project

Hi
Just created a fresh new project with studio 6.4 and gradle wrapper for idea was not installed, likely because of the error below.
Seems that graddle directory is tryingly locked more than once (multi-threading issue ?)
I had another studio project open in IDE but with a different name (of course), hence different directories.
Workaround : copy graddle wrapper directory and scripts from another studio project, reopen in IDEA and now it detects the default gradlle wrapper.
Mike


2017-02-21 12:36:23,027 INFO  [com.haulmont.studio.backend.w] Closing Project{name='busyapp'}
2017-02-21 12:36:23,027 INFO  [com.haulmont.studio.backend.t.a] Sending usage statistics
2017-02-21 12:36:48,739 WARN  [com.haulmont.studio.backend.p.t] Unable to find CLOSABLE_BLOCK for jelasticDeployWar task
2017-02-21 12:36:48,739 WARN  [com.haulmont.studio.backend.p.t] Unable to find CLOSABLE_BLOCK for jelasticBuildWar task
2017-02-21 12:36:48,739 WARN  [com.haulmont.studio.backend.p.t] Unable to find CLOSABLE_BLOCK for buildWar task
2017-02-21 12:36:48,754 INFO  [com.haulmont.studio.backend.t.a] Sending usage statistics
2017-02-21 12:36:48,755 INFO  [com.haulmont.studio.backend.w] Opening Project{name='busy'}
2017-02-21 12:36:48,766 INFO  [com.haulmont.studio.backend.e.c.e] There is no Oracle driver oracle.jdbc.OracleDriver on CLASSPATH
2017-02-21 12:36:48,766 INFO  [com.haulmont.studio.backend.e.c.e] There is no MySQL driver com.mysql.jdbc.Driver on CLASSPATH
2017-02-21 12:36:48,903 DEBUG [org.gradle.tooling.GradleConnector] Connecting from tooling API consumer version 3.1
2017-02-21 12:36:50,851 INFO  [hsqldb.db.HSQLDB5A6075B392.ENGINE] Checkpoint start
2017-02-21 12:36:50,851 INFO  [hsqldb.db.HSQLDB5A6075B392.ENGINE] checkpointClose start
2017-02-21 12:36:50,860 INFO  [hsqldb.db.HSQLDB5A6075B392.ENGINE] checkpointClose end
2017-02-21 12:36:50,866 INFO  [hsqldb.db.HSQLDB5A6075B392.ENGINE] Checkpoint end
2017-02-21 12:36:57,629 DEBUG [org.gradle.tooling.GradleConnector] Connecting from tooling API consumer version 3.1
2017-02-21 12:39:59,213 INFO  [hsqldb.db.HSQLDB5A6075B392.ENGINE] Database closed
2017-02-21 12:39:59,320 DEBUG [org.gradle.tooling.GradleConnector] Connecting from tooling API consumer version 3.1
2017-02-21 12:42:28,502 DEBUG [org.gradle.tooling.GradleConnector] Connecting from tooling API consumer version 3.1
2017-02-21 13:00:45,512 WARN  [com.haulmont.studio.backend.y.c] Error registering project files tree
java.nio.file.FileSystemException: d:\dev\studio-projects\busy\gradle\wrapper: Le processus ne peut pas accéder au fichier car ce fichier est utilisé par un autre processus.

 at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:86)
 at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97)
 at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102)
 at sun.nio.fs.WindowsDirectoryStream.(WindowsDirectoryStream.java:86)
 at sun.nio.fs.WindowsFileSystemProvider.newDirectoryStream(WindowsFileSystemProvider.java:518)
 at java.nio.file.Files.newDirectoryStream(Files.java:457)
 at java.nio.file.FileTreeWalker.visit(FileTreeWalker.java:300)
 at java.nio.file.FileTreeWalker.next(FileTreeWalker.java:372)
 at java.nio.file.Files.walkFileTree(Files.java:2706)
 at java.nio.file.Files.walkFileTree(Files.java:2742)
 at com.haulmont.studio.backend.y.c.a(SourceFile:154)
 at com.haulmont.studio.backend.y.c.e(SourceFile:227)
 at com.haulmont.studio.backend.y.c.a(SourceFile:43)
 at com.haulmont.studio.backend.y.d.run(SourceFile:108)
 at java.lang.Thread.run(Thread.java:745)

Hi,

I have tried to reproduce the problem, but in my environment Studio works well.

So could you please answer a few questions:
Did the error occur only once? Did you try to restart Studio? Did you try to restart OS?

Have you found the steps to reproduce the problem steadily?