--- title: "Resolving a \"Side-by-Side\" Error in Acctivate." description: Run the repair on your Acctivate then reboot in order to fix the ACCTivateApp.dll or other components. --- [Skip to content](https://hub.acctivate.com/articles/fix-side-by-side-error-after-installing-update#main-content) [Go to Customer Portal](https://hub.acctivate.com/tickets?hsLang=en) ![Acctivate - A CAI Solution](https://hub.acctivate.com/hubfs/Images/Logos/acctivate-cai-logo-svg.svg) - [Knowledge Base](https://hub.acctivate.com/articles) Open main navigation Close main navigation - [Knowledge Base](https://hub.acctivate.com/articles) - [Go to Customer Portal](https://hub.acctivate.com/tickets) - [Support Resources / Create Ticket](https://acctivate.com/support) [Support Resources / Create Ticket](https://acctivate.com/support) Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Knowledge Base](https://hub.acctivate.com/articles?hsLang=en) 2. [Troubleshoot](https://hub.acctivate.com/articles/troubleshoot?hsLang=en) 3. [General](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#general) April 14, 2025 # Resolving a "Side-by-Side" Error in Acctivate. ## Run the repair on your Acctivate then reboot in order to fix the ACCTivateApp.dll or other components. Occasionally when starting up Acctivate following an update or new workstation install, you may encounter a message referencing a “Side by Side Configuration Error” that keeps you from being able to start up the application. The reason users typically encounter this is due to the present Acctivate.exe version not finding the version of the ACCTivateApp.dll that it expects. This can occur if the ACCTivateApp.dll gets locked during the install or update procedure – which can lead to it not getting updated and therefore mismatched. It can also occur if you haven’t rebooted your server since the last update. **How to Resolve** Simply make sure that all applications related to Acctivate (Acctivate and Acctivate Database Maintenance) are completely closed and run the Acctivate repair. 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