Facing -static’s server IP address could not be found. error while using documentViewerField

According to the Documentation, in custom.properties file, it is set as such-

conf.suite.SERVER_AND_PORT=www.example.corp:8080
conf.suite.STATIC_SERVER_AND_PORT=www.example-static.corp:8080
conf.suite.DYNAMIC_SERVER_AND_PORT=www.example-dynamic.corp:8080
conf.suite.DISABLE_STRICT_DOMAIN_SECURITY=true

But I am still facing the error-
static’s server IP address could not be found