Camunda SDK PHP API: Notice: Trying to get property of non-object

I use the Camunda SDK PHP in my Symfony2 project.
This is my code:

$camundaAPI = new \org\camunda\php\sdk\Api(‘http://172.16.0.66:8105/engine-rest’);
//process
$processDefinitionRequest = new \org\camunda\php\sdk\entity\request\ProcessDefinitionRequest();
$processDefinitions = $camundaAPI->processDefinition->getDefinitions($processDefinitionRequest);
//id process
$data = array();
foreach($processDefinitions AS $pd) {
$data[‘processKey’] = $pd->getKey();
}
$vars = array(
“idconge” => array(
“value” => “58”,
“type” => “String”
)
);
$processDefinitionRequest->setVariables($vars);
$procInstance = $camundaAPI->processDefinition->startInstanceByKey($data[‘processKey’], $processDefinitionRequest);

an error message is displayed, I don’t know why ?? :frowning:

Hi @fatma_wings,

could you attach your error message here please?

Cheers,
Askar