Fatal Error When Activating Plugin

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Hello, when I try to activate your plugin I get the following error message:

Fatal error: Cannot redeclare class Ctct\SplClassLoader in /var/www/…/wp-content/plugins/constant-contact-forms/vendor/constantcontact/constantcontact/constantcontact/src/Ctct/SplClassLoader.php on line 23

I am switching from another plugin which is being deprecated (Constant Contact Widget). In another thread you mentioned that other Constant Contact plugins should be deactivated before activating this one. I deactivated and deleted the other plugin, and am still getting the error.

Any ideas on how to fix this? The old plugin stops working tomorrow.

Thanks.