Good morning from Germany 
oh, it looks like the security level of your log hides some important information like the service name. You have to do the following, to see all details of the log.
1. Go to the global configuration of SAP Gateway. You see the menu entry in transaction /iwfnd/error_log right here:
2. Set the error log level to "Full". After that, you can see all information of new errors. Existing entries in your log will not be affected by this setting. Heads up! In productive system, the error log level should never be on "Full" but on "Secure".
When you have done this, please reproduce the error and post again.