Your step-into request resulted in an automatic step-over of a property or operator

VS2017 and VS2019:

Tools > Options > Debugging > Uncheck "Step over properties and operators > (Managed only)".

It is not an error message as such. The IDE is telling you that tracing for some of your code is being skipped during debugging due to the current settings. If you want to be able to trace into the code, change the settings as described in the message.

You can change this behavior by going to: Tools -> Option -> Debugging.

The setting for this in VS2010 is under: Tools -> Option -> Debugging (near the middle)