problem to add vcenter 7 to opmanager

problem to add vcenter 7 to opmanager

hello
i want to add vcenter 7.0 to opmanager 12.5.129 but dont add and a error occurd
:Failed to connect the VMware Host WebService(Device may not be reachable/Credentials may be wrong)

anf erro log is :

[13:53:11:846]|[07-11-2020]|[com.adventnet.opmanager.virtualerr]|[INFO]|[272]: VMwareSessionHandler : Error occured in establishing session : 172.31.0.150|
[13:53:11:846]|[07-11-2020]|[com.adventnet.opmanager.virtualerr]|[SEVERE]|[272]: VI SDK invoke exception:org.dom4j.DocumentException: null Nested exception: null|
java.rmi.RemoteException: VI SDK invoke exception:org.dom4j.DocumentException: null Nested exception: null
    at com.vmware.vim25.ws.WSClient.invoke(WSClient.java:183)



can help me ?