Import Site, success but with Warning message

I have a live site meherbababooks.com that I need to make radical changes. I downloaded Flywheel. The database and files in zip format was a backup Oct 30 that I used.
I imported the zip backup with Flywheel stating success. I did this on two computers because I would get warnings.
This warning is when I click on View Site:
Warning: Illegal string offset ‘instance’ in /app/public/wp-content/plugins/theme-my-login/includes/class-theme-my-login.php on line 998 Warning: Illegal string offset ‘instance’ in /app/public/wp-content/plugins/theme-my-login/includes/class-theme-my-login.php on line 1002 Warning: count(): Parameter must be an array or an object that implements Countable in /app/public/wp-content/plugins/wp-e-commerce/wpsc-includes/cart.class.php on line 434 Warning: count(): Parameter must be an array or an object that implements Countable in /app/public/wp-content/plugins/wp-e-commerce/wpsc-includes/cart.class.php on line 444 Warning: Use of undefined constant php - assumed ‘php’ (this will throw an Error in a future version of PHP) in /app/public/wp-content/themes/meher/header.php on line 1 Warning: count(): Parameter must be an array or an object that implements Countable in /app/public/wp-includes/kses.php on line 828 Warning: count(): Parameter must be an array or an object that implements Countable in /app/public/wp-includes/kses.php on line 828 Warning: count(): Parameter must be an array or an object that implements Countable in /app/public/wp-includes/kses.php on line 828 Warning: count(): Parameter must be an array or an object that implements Countable in /app/public/wp-includes/kses.php on line 828
I would want to work on the site locally to test and prove any changes.
I don’t know what to do.
Let me know if you folks can help.
Thanks!

Well then I attempted to log in:
https://meherbababooks-com-1444139845-complete-2018-11-02.local/login


Warning: Illegal string offset ‘instance’ in /app/public/wp-content/plugins/theme-my-login/includes/class-theme-my-login.php on line 998 Warning: Illegal string offset ‘instance’ in /app/public/wp-content/plugins/theme-my-login/includes/class-theme-my-login.php on line 1002 Warning: count(): Parameter must be an array or an object that implements Countable in /app/public/wp-content/plugins/wp-e-commerce/wpsc-includes/cart.class.php on line 434 Warning: count(): Parameter must be an array or an object that implements Countable in /app/public/wp-content/plugins/wp-e-commerce/wpsc-includes/cart.class.php on line 444 Warning: Illegal string offset ‘user_login’ in /app/public/wp-includes/user.php on line 31 Warning: Illegal string offset ‘user_password’ in /app/public/wp-includes/user.php on line 33 Warning: Illegal string offset ‘remember’ in /app/public/wp-includes/user.php on line 35 Warning: Illegal string offset ‘remember’ in /app/public/wp-includes/user.php on line 41 Warning: Cannot assign an empty string to a string offset in /app/public/wp-includes/user.php on line 41 Warning: Illegal string offset ‘user_login’ in /app/public/wp-includes/user.php on line 56 Fatal error: Uncaught Error: Cannot create references to/from string offsets in /app/public/wp-includes/user.php:56 Stack trace: #0 /app/public/wp-content/plugins/theme-my-login/includes/class-theme-my-login.php(415): wp_signon(‘f’, ‘’) #1 /app/public/wp-includes/plugin.php(503): Theme_My_Login->template_redirect(’’) #2 /app/public/wp-includes/template-loader.php(12): do_action(‘template_redire…’) #3 /app/public/wp-blog-header.php(16): require_once(’/app/public/wp-…’) #4 /app/public/index.php(17): require(’/app/public/wp-…’) #5 {main} thrown in /app/public/wp-includes/user.php on line 56

Most of those count() errors are from a version of PHP7, I can’t remember which one. They are errors in your code that need to be fixed.

Try disabling the Theme My Login plugin.

It doesn’t seem as if you have an issue with Local.

I cannot deactivate Theme My Login plugin on local because when I attempt to log in as admin I get the warning message and no access to dashboard.

I deactivated Theme My Login on the live site, computer a; and then tested ‘my account’ on computer b. I was unable to login. There was no ability to insert ‘username’ and ‘password’ .
I then activated Theme My Login on computer a to reclaim admin access to the live site.

Let me know what’s to do to resolve this difficulty with local.
Thanks

To deactivate a plugin on Local without admin access all you need to do is move the plugin out of the wp-content/plugins/ folder. It resides on your computer.

Thanks for that tip!

I moved Theme out of wp-content and after stopping / starting local keep getting this 502 Error (the page you requested generated a server error and could not be processed) .
I put Theme back in wp-content and the 502 error went away.