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ERR99 is a general fault code. Likely you had internal condensation causing a problem. In the past I have managed to clear Err99 by powering down, removing battery, and restarting but it doesn't always work.as far as your jammed shutter is concerned, it might clear after power down but have a look into the camera to see if it is held open.. There is a way to cycle the shutter, but you need to trip the shutter actuator and for that you have to disassemble to get to the actuator arm and spring. The shutter maybe ok if you can release it.
I used to keep a spare 450D shutter on hand, they can be bought online, sometimes from Canon parts shops in the US, about $80, or you can get salvaged ones from China sold by camera strippers on Aliexpress for about $40.
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