Hello. Thank you for contacting the Toolset support.
I checked the debug information you shared and I found that you are using really outdated WordPress version, Can you please update WordPress to latest version.
In addition to that I also find that you are using really outdated Toolset plugins. We always recommend running your site with the latest stable release plugin version.
*** Please make a FULL BACKUP of your database and website.***
Could you please update ALL Toolset plugins to it's latest officially released version. You can download the latest plugin release from your accounts page:
=> https://toolset.com/account/downloads/
Can you please update ALL Toolset plugins to its latest official released version and then try to add reCaptcha to it.