JMSSerializerBundle: Symfony 4 - Class 'jms_serializer.stopwatch_subscriber' not found

In Symfony 4 I have occured a problem with JMSSerializerBundle in use with FOSRestBundle. My code looks like below:

$restresult = $this->getDoctrine()->getRepository('App:Entity')->findAll();
return View::create(['data' => $restresult], Response::HTTP_FOUND);

There is no problem when data is a pure array, but when there are even simple objects (f.ex. DateTime) that problem occurs.

Deleting JMSSerializerBundle from Kernel.php fixes the problem, because Symfony takes his native serializer when JMSSerializerBundle is not found.

Error:

"error": {
"code": 500,
"message": "Internal Server Error",
"exception": [
{
"message": "Warning: call_user_func() expects parameter 1 to be a valid callback, class 'jms_serializer.stopwatch_subscriber' not found",
"class": "ErrorException",
"trace": [
{
"namespace": "",
"short_class": "",
"class": "",
"type": "",
"function": "",
"file": "/var/www/someproject/vendor/jms/serializer/src/JMS/Serializer/EventDispatcher/EventDispatcher.php",
"line": 104,
"args": []
},
{
"namespace": "JMS\\Serializer\\EventDispatcher",
"short_class": "EventDispatcher",
"class": "JMS\\Serializer\\EventDispatcher\\EventDispatcher",
"type": "->",
"function": "dispatch",
"file": "/var/www/someproject/vendor/jms/serializer/src/JMS/Serializer/GraphNavigator.php",
"line": 188,
"args": [
[
"string",
"serializer.pre_serialize"
],
[
"string",
"App\\Entity\\SomeEntity"
],
[
"string",
"json"
],
[
"object",
"JMS\\Serializer\\EventDispatcher\\PreSerializeEvent"
]
]
},