I have a simple form for editing simple objects. The form loads and populates as expected, but the action crashes out, referring to "[Notice] Object of class SS_HTTPRequest could not be converted to int"
In CalendarPage.php:

private static $allowed_actions = array(
		'view'
		, 'edit'
		, 'editForm'
		, 'doPostEdit'
		, 'doPostDelete'
	);
	
	public function edit($request) {
		if($entryRecord = DataList::create("CalendarEntry")->byID($this->request->param('ID'))) {
			return $this->customise(array(
				'Title' => 'Edit: ' . $entryRecord->Title
				, 'OneEntry' => $entryRecord
				, 'OneEntryForm' => self::editForm($entryRecord->ID)
			))->renderWith(array(
				'CalendarPage_actions'
				, 'CalendarPage'
				, 'Page'
			));
		} else {
			// Display a 404 page if user is not allowed this action or the source object cannot be found
			return ErrorPage::response_for(404);
		}
	}
public function editForm($rID) {
		$entry = DataList::create("CalendarEntry")->byID($rID);
		$fields = new FieldList();
			$nField = new HiddenField('ID', 'ID', $rID);
				$fields->push($nField);
			$tField = new TextField('Title', 'Title', $entry->Title);
				$fields->push($tField);
		$required = new RequiredFields('Title');
		$actions = new FieldList(
			new FormAction('doPostEdit', ' Save Changes ')
			, new FormAction('doPostDelete', ' Delete Event ')
		);
		$form = new Form($this, 'editForm', $fields, $actions, $required);
		return $form;
	}
	
	public function doPostEdit($data, $form, $request) {
		$entry = DataList::create("CalendarEntry")->byID($data['ID']);
		...
		$returnURL = $entry->getEventLink('view');
		return $this->redirect($returnURL);
	}

Everything works fine so long as I don't try to create an object in the action, then it all ends up in the cactus.
Oddest thing is, other forms almost identical work without issue. Baffled! Ideas?

I dont see any mistake, try update the code like mentioned below; might help

	public function edit(SS_HTTPRequest $request) {
		if($entryRecord = DataList::create("CalendarEntry")->byID($request->param('ID'))) {
			return $this->customise(array(
				'Title' => 'Edit: ' . $entryRecord->Title
				, 'OneEntry' => $entryRecord
				, 'OneEntryForm' => self::editForm($entryRecord->ID)
			))->renderWith(array(
				'CalendarPage_actions'
				, 'CalendarPage'
				, 'Page'
			));
		} else {
			// Display a 404 page if user is not allowed this action or the source object cannot be found
			return ErrorPage::response_for(404);
		}
	}