This message may appear for a number of reasons.

1) You send a message via the internal mail, bill one of the users and enter the wrong ID. Contact the user and check their ID. Make sure you are not typing in a purse number instead of the ID. 

2) You are trying to transfer funds using a non-existent purse. Contact the user and check his/her purse number. Make sure you are not typing in a user ID instead of the purse number. 

3) You are using an old version of WMKeeper Classic, have a formal or higher passport and are trying to change your personal information in the Keeper menu. Go to the verification center website, login with your ID and change your details on the website.

4) You are transferring funds and one of your purses (either yours or that of another user) has been blocked. Purses can be blocked only by the administrator of the System. Purses are blocked in a number of cases, but not always as a result of fraudulent activities, so please do not make any hasty conclusions. Check to ensure you do not have any claims about your ID on the arbitrage service website. Contact arbitration service for details.