Hei
Iam getting issue with Business Process Flow , when i try to click on Set Active . It gives error and i cannot move to next stage . Environment is SANDBOX .
here is the error

When i delete the BPFand create new then it began to work but after 1 or 2 days iam getting again error. Its quite critical issue and iam afraid if iam getting same on production enviroment.
Any help and suggestion would be appreciated.