Issue:

The following warning is displayed when opening an electronic design/library in Fusion 360:

The board file <file_path> has errors and will be opened with warnings.

Click OK to open the file with warnings or click Export to save a copy of the file and error logs as a ZIP file to send to support. Contact support.

When clicking on "Export" and opening the ZIP file, the following notification is included in the TXT file:

Warnings:

line <number_of_line>: unknown attribute 'lock' in tag <polygonpour>

When this error is there on the file, there is a locked layer that is not allowing to move or rip up wires and the copper layer does not follow vias so it creates airwires

Solution:

Use one of the following solutions:

Continue normal work by clicking the OK button when notification will show up while opening a project in Fusion 360.
Go to the Layer tool and unlock every copper layer then save the PCB design.

Products:

Fusion;