janfelixklein

I currently have exactly the same problem when importing the [I4AAS Nodeset](https://github.com/OPCFoundation/UA-Nodeset/blob/v1.04/I4AAS/Opc.Ua.I4AAS.NodeSet2.xml) which also has a customn datatype which is refered to inside the spec itself and is throwing the...

The problem also occurs when using opcua-asyncio. I guess what happens is that at one point the nodeset defines a customn structure as a `DataType` definition, e.g. node `ns=1;i=3011 1:AASKeyDataType`...

I just tried to build open62541 on a similar system with Ubuntu 16.04 and ran into a similar error. Also no problems with it on e.g. Ubuntu 22.04