There was an issue. when i installed VMWARE PowerCLI.

“A command with name ‘Export-VM’ is already available on this system”

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it could be internet connectivity issue or something else.

anyway, i tried again.

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the previous failure caused another error.

I found a solution as described explanation in error “use -AllowClobber parameter”

this is solved by below command.

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for more detailed information, Link