If VDD and VSS are shorted. What type of errors will you get?

If VDD and VSS are shorted in an LVS (Layout versus Schematic) check, it would typically result in errors related to connectivity discrepancies between the layout and schematic representations of the circuit.

1. Short Circuit Errors: The LVS tool would detect a short circuit between VDD and VSS nodes, indicating a violation of the intended electrical connections in the circuit.
2. Mismatched Connectivity: The tool would identify that the layout design does not match the expected schematic representation, leading to inconsistencies in the connections between VDD and VSS.
3. Potential Functionality Issues: While not directly reported as errors by the LVS tool, shorting VDD and VSS can lead to functional errors in the circuit, which may manifest during subsequent simulations or testing phases.

In summary,  the LVS check would flag the short between VDD and VSS as a violation of the expected connectivity between power and ground nodes in the circuit layout compared to the schematic, helping designers identify and rectify the issue before fabrication or production.