Altium silk screen carried over into copper layer
It is a problem, since the process does not know when creating that mask that it is silkscreen and not copper. He is telling you that yellow line ends up being a trace.

The connector model's silk-screen geometry must have been mistakenly placed on the copper layer instead of the silk-screen layer. Edit the model geometry.

Note, whatever U5 is, also has a problem, though you got lucky in this case in that it does not interferes with any of the surrounding traces.