Thanks for reply.
1.I used Opencart Version 126.96.36.199.
2. I have to install ThemeForest theme -https://themeforest.net/item/yourstore-opencart-theme/16754918.
3. I haven't modified any permission of any file at the time of theme installation, but later on, once I got above errors then I have Modified the cache and storage folder permission to 777 but it's not worked.
4. I have first install opencart using the app then add theme files, then in the admin panel, I have to go to modification section to click on the refresh button when I clicked on refresh button then got errors.
Thanks & Regards,