Today I faced the same problem. This issue is related to how the domain was created. If you used the "base domain of the SIP server", this will happen when installing the ear. You can double check whether a domain is created using Basic SIP or not, go to the file Weblogic Server Domain >> bin >> setDomainEnv (cmd or sh)and check if the following properties are defined.
-- set WLSS_HOME=C:\Oracle\Middleware\wlserver_12.1\sip
-- set SIP_ENABLED=true
I tried to create the domain again with the JAX-RPC extension instead of Basic SIP and solved this problem.
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