Hi felixlahemade,
I have exactly the same error. My scenario is: VM Linux cloned from another VM esx5.0 compatible.
Perfectly work, but with an old OS release. So upgraded it to Centos8. Now running but with the same old CPU/RAM configurations, so I try to upgrade to 4CPU and 8GB RAM.
In PowerOff mode, edit configuration and apparently work but at the bottom of Vcenter webpage a warning icon appear with this error:
Unexpected token (END_OBJECT), expected FIELD_NAME: missing property '_type' that is to contain type id (for class java.lang.Exception)
at [Source: java.io.StringReader@44ea78eb; line: 54, column: 9] (through reference chain: com.vmware.vsphere.client.vm.VmConfigSpec["originalConfig"]->com.vmware.vim.binding.vim.vm.ConfigInfo["tools"]->com.vmware.vim.binding.vim.vm.ToolsConfigInfo["lastInstallInfo"]->com.vmware.vim.binding.vim.vm.ToolsConfigInfo$ToolsLastInstallInfo["fault"])
I'm using vcenter with vsphere 6.5.
So, I have upgrade compatibility to esx6.5, migrate to other Host, and other test, but I have the same result.
Can you help me?
Regards
Alessandro Agostini