Hi,
in 20 years of using Altium this has never happened to me before...
I have a large complex FLAT design (i.e. no multi-channel nor hierarchical) which design which I used plenty of time as base design for other projects. It always compiled perfectly with no errors and so did all projects I derived from it.
Today I used it again to start a new project and I added various components. I kept compiling all along and it was all ok every time I compiled it. Then after adding a couple of more components it suddenly started giving more than 100 (!!) errors "Duplicate net name wires xxxx". That occurs for 90% of the nets that never gave any errors before and that I have not touched (nor connected to) when adding those few new components.
That occurs whether I select the project to be flat configuration or automatic. In either case, being a flat design, any duplicate net labels should just connect together not give an error.
I removed the components most recently added (since the previous succesfull compile) just in case they cause it, but those errors remained. Hundreds of them all addressing hundreds of nets which previously (for years!) always compiled without any errors.
Anyway... Any suggestions what it could be and how to solve it? Maybe some "clean net" or "hard recompile" type solution?
Any suggestion greatly appreciated!!
Many thanks