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You can either print the thing at an angle or increase you exposure. Those are the two main ones.

Printing with the base flat to the buld plate? If so, It's probably a suction failure. There needs to be a small hole to let the liquid resin flow into the middle to relieve the suction pressure.

This is the most likely cause (suction).

Yeah, never print flat, always angle and use supports.

Resin is different from filament, supports and avoiding the build plate are your friends, not your enemies.

Make the model thicker or add supports for weak spots.

Your printer has covid19 and you have to throw it away

Suction is a likely culprit. Though if the model has some errors that could cause something like this as well. Making the walls a little bit thicker could help.

Where should the hole go? Out the side near the base?

Jonathan Basseri Yep. You;ll need one any time you're printing a bowl-shape, even if it's up on supports. If there's the potential to suction, you'll need to add a hole.

thanks for the advice I appreciate it

as I begin my modeling journey I have avoided too many supports as I have not yet mastered how/where to put them. My searching on the forums advises chitubox but the number of supports this generates makes cleaning up the model difficult and ends up messy and not clean lines. For this model it generated as below

here is number generated, yes I laid it flat maybe try angled next time I appreciate the assistance

Check that your room is within the recomended temperature for the resin.