In case you use a pirated version:
Uninstall, buy the legit one from the Play Store
In case you use a legally bought one:
Enter Settings -> Applications, find Mobile ODIN, Force Stop, Clear Cache, Clear Data, Uninstall.
Re-Install from Play Store
If it still doesn't work manually download the p3100 flashkernel package and install it (see Chainfire's thread
If the problem persists contact Chainfire - Chainfire is very helpful to legit users/customers.