Thank you for getting in touch.
Would you mind allowing me to have admin access to the website so that I can have a more detailed look at this for you ?
I've enabled the private fields for your next response.
I will also need to grab a cop of the site as well for local testing.
The problem was being caused by running an older version of Types. I went ahead and updated it to the latest version and now it can be activated without any issues.
Warning: include_once(/home/up2youdev/www/wp-content/plugins/types 2/application/models/compatibility/yoast/field/factory.php): Failed to open stream: No such file or directory in /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/utility/autoloader.php on line 127
Warning: include_once(): Failed opening '/home/up2youdev/www/wp-content/plugins/types 2/application/models/compatibility/yoast/field/factory.php' for inclusion (include_path='.:/usr/share/php') in /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/utility/autoloader.php on line 127
Fatal error: Uncaught ReflectionException: Class "OTGS\Toolset\Types\Compatibility\Yoast\Field\Factory" does not exist in /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/StandardReflector.php:29 Stack trace: #0 /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/StandardReflector.php(29): ReflectionClass->__construct() #1 /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/CachingReflector.php(73): OTGS\Toolset\Common\Auryn\StandardReflector->getParamTypeHint() #2 /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/Injector.php(527): OTGS\Toolset\Common\Auryn\CachingReflector->getParamTypeHint() #3 /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/Injector.php(474): OTGS\Toolset\Common\Auryn\Injector->buildArgFromTypeHint() #4 /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/Injector.php(414): OTGS\Toolset\Common\Auryn\Injector->provisionFuncArgs() #5 /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/Injector.php(373): OTGS\Toolset\Common\Auryn\Injector->provisionInstance() #6 /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/Injector.php(542): OTGS\Toolset\Common\Auryn\Injector->make() #7 /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/Injector.php(474): OTGS\Toolset\Common\Auryn\Injector->buildArgFromTypeHint() #8 /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/Injector.php(639): OTGS\Toolset\Common\Auryn\Injector->provisionFuncArgs() #9 /home/up2youdev/www/wp-content/plugins/types 2/application/bootstrap.php(115): OTGS\Toolset\Common\Auryn\Injector->execute() #10 /home/up2youdev/www/wp-includes/class-wp-hook.php(303): {closure}() #11 /home/up2youdev/www/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters() #12 /home/up2youdev/www/wp-includes/plugin.php(470): WP_Hook->do_action() #13 /home/up2youdev/www/wp-admin/admin.php(374): do_action() #14 /home/up2youdev/www/wp-admin/post.php(12): require_once('...') #15 {main} Next OTGS\Toolset\Common\Auryn\InjectionException: Could not make OTGS\Toolset\Types\Compatibility\Yoast\Field\Repository: Class "OTGS\Toolset\Types\Compatibility\Yoast\Field\Factory" does not exist in /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/Injector.php:422 Stack trace: #0 /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/Injector.php(373): OTGS\Toolset\Common\Auryn\Injector->provisionInstance() #1 /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/Injector.php(542): OTGS\Toolset\Common\Auryn\Injector->make() #2 /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/Injector.php(474): OTGS\Toolset\Common\Auryn\Injector->buildArgFromTypeHint() #3 /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/Injector.php(639): OTGS\Toolset\Common\Auryn\Injector->provisionFuncArgs() #4 /home/up2youdev/www/wp-content/plugins/types 2/application/bootstrap.php(115): OTGS\Toolset\Common\Auryn\Injector->execute() #5 /home/up2youdev/www/wp-includes/class-wp-hook.php(303): {closure}() #6 /home/up2youdev/www/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters() #7 /home/up2youdev/www/wp-includes/plugin.php(470): WP_Hook->do_action() #8 /home/up2youdev/www/wp-admin/admin.php(374): do_action() #9 /home/up2youdev/www/wp-admin/post.php(12): require_once('...') #10 {main} thrown in /home/up2youdev/www/wp-content/plugins/types 2/vendor/toolset/toolset-common/lib/auryn/lib/Injector.php on line 422
On the locally installed copy of your site I was able to access the ACF admin pages without any problems.
But that was using a local version of Types rather than the version you have on your site, so to rule out that the issue could be caused by something wrong with the installation of Types on your server I went to reinstall it.
I deleted the existing install, and then tried to upload the zip file of the current Types version on the Add New plugins page.
Could you update the server settings for upload_max_filesize, which should probably be at least about 16Mb, possibly more depending on what you aim to install on your site.
I hadn't made any changes since I was trying (and failing) to upload a plugin yesterday afternoon, and although I couldn't upload a plugin because the server settings are too small, I was still able to navigate the back end of the site.
I have just now used FTP to try to check the logs on the servers, and I can see the access logs show that requests are generating 500 http codes (an internal server error), but the PHP logs themselves don't report what the errors are.
I tried renaming the plugins directory in case the error arose from one of the plugins somehow, but that didn't help (I've now renamed it back again).
So I don't know what the problem is, I'm afraid, I only undertook "normal" operations.
If the problem doesn't resolve itself, I think you'll need to ask the host if they can identify the problem (and also increase the max upload size at the same time).