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Jessica LanzaroneJessica Lanzarone 

I am receiving an error in the chatter module that says admin needs to deactivate the locker service

sagarika bsagarika b
Hi,

When LockerService is enabled for sandbox and DE org's, rich-text editors are disabled and rich-text fields are read-only. You can switch to Salesforce Classic to perform many of the tasks that use rich-text editors or fields unless mentioned otherwise. Your Salesforce admin can also deactivate LockerService in Setup to remove this limitation in Spring ’17. This limitation only impacts sandbox and Developer Edition (DE) org's and does not impact production orgs. Rich-text editors and rich-text fields in production org's continue to function normally even when LockerService is activated.This limitation will be removed before LockerService is auto-enabled in Summer ’17. In Spring ’17, the LockerService critical update enables your admin to test LockerService and Content Security Policy updates in its entirety in a sandbox and DE org's. This enables yours org's to achieve compliance before LockerService is auto-enabled in Summer ’17.

For more information may I suggest you please check with below link
https://releasenotes.docs.salesforce.com/en-us/spring17/release-notes/rn_general_rich_text_editor_cruc.htm

Please mark this as solved if it is resolved.

Regards,
Sagarika