[Opensource] No ActionForm found for key '" + formKey + "' in session error

[Eddie Lewis]

This exception occurs when calling the following method in the
ControllerResponse object
Method - 
    private DefaultForm getDefaultForm() throws ControllerException {
         String formKey = getRequest().getFormAttribute();
        if (StringUtil.notNull(formKey).equals("")) {
            throw new ControllerException("No ActionForm has been specified
for this Controller mapping,"
                + " unable to utilize form cache. Please set an action form
in the struts-config.xml file.");
        }
        DefaultForm myForm = (DefaultForm)
getRequest().getSession().getAttribute(formKey);
        if (myForm == null) {
            throw new ControllerException("No ActionForm found for key '" +
formKey + "' in session.");
        }
        return myForm;
    }
 
Any ideas why i get this exception.
This is being called from the autoInput method for a DBObject field.
 
Thanks
Ed
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