If I can't make this run, then I can't throw my miner on this.
This appear as soon as you launch the wallet? or during sync?
If this is a new wallet with 0 coin , just Delete all files and folders in your Eurocoin data-folder, which is most likely: %AppData%\Roaming\Eurocoin and restart wallet
If you have coins in there make a backup wallet.dat file before doing so.