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You have an old version of the shadowcash client so you need to upgrade to fix your problem

You can get the latest version from the official shadowcash website https://shadowproject.io/ under /getting started/

(Do not trust quoted download links on this forum)


If you want to sync up quickly use the bootstrap here:  https://github.com/shadowproject/bootstrap



Edit: And yes, make multiple copies of your wallet.dat and store them offline safely.