"Unable to find appropriate service endpoint information in the configuration object Dynamics Ax 2012"
There can be multiple reasons to see this error while working on SSRS report in AX 2012.
SSRS reports and AOS services communicate via WCF services and these WCF services are either not running on AOS or need to refresh under AX client configuration.
First would be, BIServices is not activated under System Administration > Setup > Services and Application Integration Framework > Inbound ports.
Second option to resolve this error is to refresh WCF configuration under Connection tab of Dynamics AX Client Configuration.
This configuration file contains WSDL Port which is used to talk BIServices as shown above. If BIServices are activated in first step then import your AX configuration file into AX Configuration Utility and press Refresh Configuration button.