Siriphol, you may have a backup available in the backup folder inside your project directory. If so,  click on help and search for backup or restore and follow the instructions.

I have checked it , but there is nothing in the backup folder. 

Siriphol, had you done much work? By default WX5 Evo13 will create a backup whenever you upload using the built in ftp engine, and optionally create a backup the first time you save your project (this option accessible by the down arrow next to save).

If you have done a great deal of work, please advise. There may be someone online who can recover your project.

However, the fastest route may simply be to start again.

In future (I have 20/20 hindsight), it is strongly recommended you make the occasional manual backup by going to step 5 and selecting Export the project. If you copy this file to a USB stick or external drive this will give you a bullet proof backup.

My apologies I could not be of more assistance.