How to resolve this error a problem occured: no such column 'rrpu__alert_message__c' exists on entity 'account' salesforce

Hi @Donna Autrey, 

1. Check if the field exists:

• Go to Setup → Object Manager → Account
• Under Fields & Relationships, search for rrpu__alert_message__c

 If it doesn't exist, proceed to step 2.

 If it exists, check your field-level security and profile access.

2. Reinstall or Fix the Package:

• It’s likely that the PopUps package installation was incomplete or failed to deploy all components.
• Try uninstalling and reinstalling the managed package (PopUps).
• Or contact the package provider (developer/vendor of PopUps) and raise a case.

3. Check for Custom Code:

• If this error appears from a custom Lightning component or Apex code, search for any references to rrpu__alert_message__c and comment/remove/update them as needed.

If this work for you please mark it as the "Accepted answer". so it can help other too.