Hi Joanna,
Thank you for reaching out to us.
It appears that the Marketplace Membership module is enabled on your end, but no plans have been configured yet. This is why you’re encountering this. If you’d like to charge a subscription for vendor registration, please add the plans and then review the registration flow again.
For guidance on setting up the Marketplace Membership module, you can refer to our documentation here https://multivendorx.com/docs/knowledgebase/marketplace-memberhsip/.
If you have any further questions, feel free to let us know—we’re happy to help!