Ant clean not working

Open Source Development
1 
91812@LAPTOP-VJFRAPEI MINGW64 ~/Desktop/AppPreet/appinventor-sources/appinventor (master)
$ ant clean
Buildfile: C:\Users\91812\Desktop\AppPreet\appinventor-sources\appinventor\build.xml

clean:

clean:
   [delete] Deleting directory C:\Users\91812\Desktop\AppPreet\appinventor-sources\appinventor\build\appengine
   [delete] Deleting directory C:\Users\91812\Desktop\AppPreet\appinventor-sources\appinventor\appengine\build
   [delete] Deleting directory C:\Users\91812\Desktop\AppPreet\appinventor-sources\appinventor\appengine\reports

clean:
   [delete] Deleting directory C:\Users\91812\Desktop\AppPreet\appinventor-sources\appinventor\build\blocklyeditor
   [delete] Deleting directory C:\Users\91812\Desktop\AppPreet\appinventor-sources\appinventor\blocklyeditor\build
   [delete] Deleting directory C:\Users\91812\Desktop\AppPreet\appinventor-sources\appinventor\blocklyeditor\reports

clean:

clean:
   [delete] Deleting directory C:\Users\91812\Desktop\AppPreet\appinventor-sources\appinventor\build\buildserver
   [delete] Deleting directory C:\Users\91812\Desktop\AppPreet\appinventor-sources\appinventor\buildserver\build

BUILD FAILED
C:\Users\91812\Desktop\AppPreet\appinventor-sources\appinventor\build.xml:165: The following error occurred while executing this line:
C:\Users\91812\Desktop\AppPreet\appinventor-sources\appinventor\build-common.xml:265: Unable to delete file C:\Users\91812\Desktop\AppPreet\appinventor-sources\appinventor\buildserver\build\run\lib\activation-1.1.jar

Total time: 3 seconds

how to solve this error ?

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2

Do you have the server running? You can't delete files whilst they are in use.

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3

Restart your pc,It happens when its running

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