Thank you for paying attention. This error occurred in the wallet v0.3.0.50, the reinstallation and delet of all files.. did not help, the older and newer version wallet did not solve the problem either.  the problem solved with an old wallet clintar https://github.com/clintar/boolberry/releases , thx buddy.

PS: on version v0.3.0.48 the problem was solved by delet poolstate.bin in C:\Users\User\AppData\Roaming\boolb