[Flow] OneToOne Relation issue

[The Social Nerd]

Hi there,

I have declared a OneToOne-Relation between two models A and B with \ORM. Then I updated my database with the command ./flow doctrine:update and everything works fine. Now I implemented the following function:

/*
* @param \PG\Sample\Domain\Model\ModelB $modelB
 * @return void
*/

public function addModelB(ModelB $modelB) {
	$modelA = new \PG\Sample\Domain\Model\ModelA(); 
	$modelA->setTitle("test");
	$modelA->setModelB($modelB);
	$this->modelARepository->add($modelA);	
}

After I sent a POST-Request with the ModelB-Object, I get the following error:  PHP Fatal error:  Doctrine\\ORM\\Proxy\\ProxyFactory::getProxy(): Failed opening required '/var/www/sample/Data/Temporary/Development/Doctrine/Proxies/__CG__PGSampleDomainModelB.php' But the reference was written correctly into my database so I don't understand what`s wrong with my code.

Any ideas?

Best,
Pascal