This support ticket is created 3 years, 10 months ago. There's a good chance that you are reading advice that it now obsolete.
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Recently I updated the Toolset Types to the latest version 3.3.11. But I think it has a bug. It's restricting one of the custom posts from saving. Hence I have to roll back to the previous version and things are working fine.
In order to understand what this error is you will need to enable the debugging for wordpress.
Can you follow the instructions in the link below to enable the wordpress debugging so that I can have a better understanding of what the error is ? hidden link.
You will need to perform the exact same steps on your site that produced the error in order for us to get a popup of the error to see what the message is.
Once you've done this please copy and paste the error message in the forum.
While saving the post type the WP is showing "There has been a critical error on your website. Please check your site admin email inbox for instructions."
Please check the issue at the earliest.
The WP debugging is also enabled.