Error Code Master

A component subscribed to changing derived state and React kept re-rendering.

• Avoid returning new arrays or objects directly from store selectors.
• Move derived filtering and mapping into useMemo after reading stable store slices.
• Refresh the preview after a fix to clear stale error overlays.

A tapped port has no cable attached, so there is no upstream path to trace.

• Confirm the port is occupied in the diagram.
• Use search to locate the device label and port label.
• Verify the cable layer is visible from the toolbar.

The selected device could not fit in the chosen U position or overlaps another device.

• Check available rack units above and below the target slot.
• Try another open U position in the same rack.
• Increase rack height if the device library entry needs more space.

The requested page was not found or the route was renamed.

• Return to the main canvas from the home link.
• Use a fresh navigation instead of an old bookmarked path.
• If this persists after deployment, review routing changes.