[TYPO3-mvc] FED :: <fed.form.multiupload /> :: No value found for key "Tx_Fluid_ViewHelpers_FormViewHelper->formObject"

[Roland]

hi everybody,

i just try to add a multiupload functionality via FED viewhelper 
form.multiUpload to an extbase extension:

--- quote ---
<f:form method="post" controller="Stellungnahme" action="upload" 
name="kurzkommentar" object="{ausschreibung.kurzkommentar}">
	<fed:form.multiUpload property="anhang" />
</f:form>
--- /quote ---

this error message is outputted:

--- quote ---
No value found for key "Tx_Fluid_ViewHelpers_FormViewHelper->formObject"
--- /quote ---

i subclassed the StellungnahmeController as noted in the FED instructions:

--- quote ---
class Tx_Wissensdatenbank_Controller_StellungnahmeController extends 
Tx_Fed_Core_AbstractController {
	...
}

http://fedext.net/fed-viewhelpers/form/multi-upload.html

i am pretty sure that {ausschreibung.kurzkommentar} represents a valid 
object because {ausschreibung.kurzkommentar} in the same fluid template.

additionally this outputs a textarea without any error message:

--- quote ---
<f:form method="post" controller="Stellungnahme" action="upload" 
name="kurzkommentar" object="{ausschreibung.kurzkommentar}">
	<f:form.textarea property="anhang" rows="" cols="" />
</f:form>
--- /quote ---

any tipps?

kind regards.

roland