Plug-in Registered with Incompatible Version

The remote plug-in does not display in the vSphere Client user interface.
The plug-in does not appear in the object navigator, but it is listed in the vSphere Client under
Admin
Client plugins
.
The plug-in did not deploy because the
extension.version
is not well formatted.
The
vsphere-client-virgo.log
file contains an error message saying that the plug-in version is not well formatted:
DEPLOYMENT_FAILED: Error deploying plugin package extension.key:extension.version. Reason: Deployment error. java.lang.NumberFormatException: For input string: "some string".
  1. Verify that the
    extension.version
    is in the format "
    A.B.C.D
    ", where:
    • A
      ,
      B
      ,
      C
      , and
      D
      are numbers.
    • A
      is mandatory.
    • B
      ,
      C
      , and
      D
      are optional.
    The following examples form valid version strings:
    • "1"
    • "2.3"
    • "5.4.2"
    • "12.3.22.4"