Ok, my project says this: “A setup with at least 2 regions is being used in a single-region analysis type. Please ensure that only one fluid region exists and that all other bodies are assigned to an advanced concept. If you have already meshed your geometry, ensure that all the meshing regions except one are cell zones.” I don’t really know how should I fix this and how to put it to only 1 region. URL:https://www.simscale.com/workbench/?pid=6780424489064191208&mi=spec%3A84cd225b-c386-4f83-9a83-5897fe58f8c3%2Cservice%3ASIMULATION%2Cstrategy%3A42&ps=analysis%2FboundaryConditions%2F2
Hello
Please have a look at this documentation on how to solve this issue 
Error: Multi-Region Mesh in Non-CHT Simulation | SimScale
Best regards
Sebastian