# Installing Mailchimp Data Sync app returns error with blank details

**URL:** <https://community.hubspot.com/t/installing-mailchimp-data-sync-app-returns-error-with-blank-details/37219>\
**Category:** Data Hub\
**Created:** [May 12, 2021, 5:57pm UTC](https://community.hubspot.com/t/installing-mailchimp-data-sync-app-returns-error-with-blank-details/37219 "2021-05-12T17:57:35Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jwolver](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/jwolver/32/86357_2.png) [@jwolver](https://community.hubspot.com/u/jwolver)\
**Post date:** [May 12, 2021, 5:57pm UTC](https://community.hubspot.com/t/installing-mailchimp-data-sync-app-returns-error-with-blank-details/37219/1 "2021-05-12T17:57:35Z")

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Hi,  
I am trying to install the Mailchimp Data Sync app through marketplace. I am able to authorize Mailchimp and then I allow Hubspot connecting in the popup window. Then I am taken back to the Hubspot window with an error message with no details. I have attached a screenshot of the error message.

 ![Screen Shot 2021-05-12 at 10.47.05 AM.jpg](https://d2qpr2jzcazej7.cloudfront.net/original/3X/0/f/0f75f47baeaebedf7502d8d8000eac588181a251.jpeg)  
error message with no details  
I reached out to the chat for help and they advised me to ask my question here. I am on the free tier. I understand that if I want Custom Field Mappings I need to upgrade to the Starter tier, but I don’t know if I need that yet and would like to try the Data Sync first before I upgrade.  
Does anyone know why this is happening and if there is anything I can do to fix it?  
Thanks,

Jerry

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<div class="post-metadata">

**Author:** ![jwolver](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/jwolver/32/86357_2.png) [@jwolver](https://community.hubspot.com/u/jwolver)\
**Post date:** [May 13, 2021, 5:15pm UTC](https://community.hubspot.com/t/installing-mailchimp-data-sync-app-returns-error-with-blank-details/37219/2 "2021-05-13T17:15:45Z")

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For anyone interested, I found the solution myself. Another user had tried to data sync earlier and then deleted it, but Mailchimp still had the app installed on their end. So I removed the Hubspot app in Mailchimp and retried installing data sync in Hubspot and it worked.