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    Nintex Knowledge Base

    Error "Failed to retrieve form control for canvas"

    Summary
    When changing Single Line Text control "Connected to' field the 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).

    Solution
    Make sure a site collection is created at the root level for the web application where the error occurs. Please refer to the below article. 

    https://support.microsoft.com/en-us/kb/936914
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