Yeah mate, just rebuild your block chain... so many people bitching about this..

Step 1..

Run (windows + r)

Step 2 ..

Type in %appdata%

Step 3

Rename Sikka Folder

Step 4

Reload wallet

Step 5 Donate to my wallet for fixing your issue...

37fFoDMQpFM3ztHMEjEywGK18WG9wfe95WS7MVQcyJMvU6yMvWaLaxpSUYF1A7pM4uAwnqwVtNviYPL kyojiosedDiRFebV

You're Welcome