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    Nintex Knowledge Base

    Error "Failed to retrieve form control for canvas"

    Status: Validated

    ISSUE
    When changing Single Line Text control "Connected to' field the following error occurs.

    Failed to retrieve form control for canvas. Error: Object reference not set to an instance of an object.. Stack trace: at Nintex.Forms.SharePoint.Services.NfWcfService.GetUpdatedFormControlForCanvas(FormControlProperties formControlProperties, FormVariable variable).
    ERROR CODE
    ULS messages: Failed to retrieve form control for canvas. Error: Object reference not set to an instance of an object.. Stack trace: at Nintex.Forms.SharePoint.Services.NfWcfService.GetUpdatedFormControlForCanvas(FormControlProperties formControlProperties, FormVariable variable). Exception trying get context compatibility level: System.IO.FileNotFoundException: The site http://corleone.ecp.priv:80/_vti_bin...ntrolForCanvas could not be found in the Web application SPWebApplication Name=SharePoint DEV - 80. at Microsoft.SharePoint.SPSite.LookupSiteInfo(SPFarm farm, Boolean contextSite, Boolean swapSchemeForPathBasedSites, Uri& requestUri, Boolean& lookupRequiredContext, Guid& applicationId, Guid& contentDatabaseId, Guid& siteId, Guid& siteSubscriptionId, SPUrlZone& zone, String& serverRelativeUrl, Boolean& hostHeaderIsSiteName, Boolean& appWebRequest, String& appHostHeaderRedirectDomain, String& appSiteDomainPrefix, S
    RESOLUTION
    Make sure a site collection is created at the root level for the web application where the error occurs.
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