These errors are usually related to the SOLIDWORKS (SW) PCB Connector extension. Navigate to the Extensions & Updates page:
Click on the portrait icon in the upper right corner (DXP menu for V15 - 17) ► Extensions and Updates… ► verify the Installed tab is selected ► locate the SOLIDWORKS PCB Connector tile and click on the title to open the extension details page where you will see which version of the extension is installed.
If you have a license for the SOLIDWORKS PCB Connector, and the installed version is not 2018.3.0.576 or later, then update the extension to the current version. If you do not have a license for the SOLIDWORKS PCB Connector, uninstall the extension. Note: For most changes made to the platform installation, e.g. install/update/remove extensions, you will need to restart the software - therefore it is recommended to close all your documents/designs before making any installation changes. Here's more detailed information on working with extensions: https://www.altium.com/documentation/altium-designer/extending-altium-designer