Solution 31371: TI-Nspire™ Family or TI-SmartView™ Family Software Activation Returns an Error P20, C20, C21, or A24.
How do I resolve errors P20, C20, C21, or A24 that occur during activation of a TI-Nspire or TI-SmartView Software?
Errors P20, C20, C21, and A24 are primarily used for logging and do not occur in normal error dialogs. If you are experiencing one of these errors, please gather diagnostic logs
and contact TI