Unable to create the semaphore (0)

[olegpro]

Hi!

I get this error:

[RuntimeException] 
Unable to create the semaphore (0)
/htdocs/vendor/misterion/ko-process/src/Ko/Semaphore.php:81
#0: Ko\Semaphore->__construct(integer)
        /htdocs/vendor/misterion/ko-process/src/Ko/SharedMemory.php:90
#1: Ko\SharedMemory->__construct()
        /htdocs/vendor/misterion/ko-process/src/Ko/ProcessManager.php:196
#2: Ko\ProcessManager->createProcess(object)
        /htdocs/vendor/misterion/ko-process/src/Ko/ProcessManager.php:190
#3: Ko\ProcessManager->fork(object)

What could be the problem?