doubt about track

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Hi,
I am completing the Advance PCB Design course, In the downloaded example projects of lesson 4, i got this tracks which are routed like net . What is this.I am not able to delete /edit/move.I found it first time. Is this my altium bug? Attached image. Please help.

[robertferanec]

I just answered similar question here: https://designhelp.fedevel.com/forum...7283#post17283

They are error markers.

[[email protected]]

Thanks sir.