Problem with legacy plugin in Web Client

scriptPlugin.enabled=true

allowHttp=true

I can see that the directory was created:

C:\ProgramData\VMware\vSphere Web Client\script-plugin-packages\com.vmware.vim.viClientScripts\aastra_test_name-6.5

but the file 'plugin-package.xml' is empty there.

I'm getting in the log 'vsphere_client_virgo.log':

com.vmware.vise.extensionfw.ExtensionManager  Error retrieving deployment data for the plugin package at C:\ProgramData\VMware\vSphere Web Client\script-plugin-packages\com.vmware.vim.viClientScripts\aastra_test_name-6.5 java.io.IOException: org.xml.sax.SAXParseException: Premature end of file.

and

com.vmware.vise.vim.commons.i18n.CatalogManager  Loading catalog '/catalog/extensions/aastra_test_name/locale/en/extension.vmsg' from 'C:\ProgramData\VMware\vSphere Web Client\catalog\\VirtualCenter\5.1.0\en\aastra_test_name\extension_47134c84b0df762d8f9ac18942dd66ef.vmsg'

As far as I can see, there is no other information in the log related to the package. I attached the log. I also attached my script configuration.