1. When we execute the Static deploy command on putty , we may get below issue
Unable to load theme by specified key: ‘Magento/mytheme’.
1. Clear cache & flush cache
2. Exectute again static deploy
Still if your getting issue then follow below steps
3. Delete your theme from Database
4. Exectute again static deploy content
5. Clear cache & flush cache
6. It will work. Mean while your theme also be create from Database.