Does it attempt to open the lens when you switch it on. If it seems to be jamming as it tries then there might be something you can do to clear it.
I don't know the SX50 but I wrote the 2 repair guides on the SX200IS which is likely to be similar. The lens contains 2 motors and several sensors, and a mechanical or electrical problem with any of them will produce a "Lens Error". Follow the disassembly guide [guide|41967] and take care to re-seat all the connectors. If that doesn't fix it, lens disassembly is probably possible but difficult, and reassembly will need a LOT of patience, but it might reveal the cause of a mechanical jam.