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    Nintex Knowledge Base

    Error "The expression prefix 'NWLResources' was not recognized" in logs

    Status: Validated

    ISSUE
    When viewing web front-end logs, the following error might appear frequently:

    Load control template file /_controltemplates/NWLOnlineComponents.ascx failed: The expression prefix 'NWLResources' was not recognized.

    The error does not appear to have any impact on workflows.
    ERROR CODE
    RESOLUTION
    • Ensure that NWLOnlineComponents.ascx has been added to the web application's web.config.
    • Activate the web application, using the Nintex Workflow "Web Application Activation" page, for the appropriate web application.
    ADDITIONAL INFORMATION
    The NWLOnlineComponents.ascx file is deployed to the C:\\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\CONTROLTEMPLATES folder as part of Nintex Workflow. When an application pool is recycled, SharePoint iterates through all items in this folder. The error above occurs if any of them are not listed in the web application's web.config.

    SharePoint does not care which web applications have been activated, it expects all control templates on disk to have an entry in each web application's web.config as the file system is shared amongst all web applications.

    Nintex has no control over this except to provide a way to add the entry to the web.config. If you do not activate the web application using the "Web Application Activation" page, this error will persist.

    Our recommendation is to use the "Web Application Activation" to ensure the entry is present in each web application's web.config.
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