I got it working, i already had tried what you suggested. (adding an extra IPC runtime and HMI) but i kept getting the error message. Problem was that AMS NED ID in the OES config was not correct, and as long as there was only one HMI on the same target systems as the plc. The connection for HMI went VIA ADS localhost 127.0.0.1.1.1 and everything worked fine. But when i added the extra IPC RT and HMI and did an export the wrong ADS NED ID was in the export files. After putting the correct AMS NET Id in the OES and export it works fine. Thanks for putting me on the right track !
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