Answers.Body: <p>I had the same issue once, I changed the value for "PrevNext Cache" from "Default(Auto-detect)" to "SQL" under Administer > System Settings > Misc. This fixed the issue</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-03-28T06:29:17.940Z
Answers.LastActivityDate: 2019-03-28T06:29:17.940Z
Answers.UserDisplayName: Vikas BN
Body: <p>When attempting to merge accounts, I receive this message:</p>
  
  <p>CiviCRM_API3_Exception: "You have requested a non-existent service "prevnext.driver.". Did you mean one of these: "prevnext.driver.redis", "prevnext.driver.sql"?"</p>
  
  <p>How might I go about fixing this issue?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-03-14T19:25:12.343Z
Comments.Text: Might be similar to https://civicrm.stackexchange.com/questions/24479/event-error-civi-flexmailer-required-tokens. Try the answers there.
Comments.UserDisplayName: Demerit
Tags: <duplicate-contacts>
Title: Error when merging accounts
ThreadText: # Error when merging accounts
  
  (Asked by: username_0 on 2019-03-14)
  
  When attempting to merge accounts, I receive this message:
  
  CiviCRM\_API3\_Exception: "You have requested a non-existent service "prevnext.driver.". Did you mean one of these: "prevnext.driver.redis", "prevnext.driver.sql"?"
  
  How might I go about fixing this issue?
  
  **Tags:** duplicate-contacts
  
  > **Comments:**
  > **username_1**: Might be similar to https://civicrm.stackexchange.com/questions/24479/event-error-civi-flexmailer-required-tokens. Try the answers there.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2019-03-28. Score: 1
  
  I had the same issue once, I changed the value for "PrevNext Cache" from "Default(Auto-detect)" to "SQL" under Administer > System Settings > Misc. This fixed the issue
  
  
  ---
  
  