Setting 'statuscode' throws exception about php-crm-toolkit HOT 9 CLOSED

$task->statecode = 1;
$task->statuscode = 5;

(
    [logicalName] => statecode
    [label] => Activity Status
    [description] => Shows whether the task is open, completed, or canceled. Completed and canceled tasks are read-only and can't be edited.
    [format] => 
    [maxLength] => 0
    [isCustom] => 
    [imeMode] => 
    [isPrimaryId] => 
    [isPrimaryName] => 
    [type] => State
    [isLookup] => 
    [isValidForCreate] => 
    [isValidForUpdate] => 
    [isValidForRead] => 1
    [requiredLevel] => SystemRequired
    [attributeOf] => 
    [optionSet] => AlexaCRM\CRMToolkit\Entity\OptionSet Object
        (
            [name] => task_statecode
            [type] => State
            [displayName] => Status of the task.
            [description] => Status of the task.
            [options] => Array
                (
                    [0] => Open
                    [1] => Completed
                    [2] => Canceled
                )

            [isGlobal] => 
        )

    [lookupTypes] => 
)

$tid = $task->create();
$task = $this->dynamics->entity('task', $tid);
$task->statecode = new OptionSetValue(1); // completed 
$task->statuscode = new OptionSetValue(5); // completed
$task->update();
return $tid;

            /* Check that this property can be set in Creation or Update */
            if ( $this->attributes[ $property ]->isValidForCreate == false && $this->attributes[ $property ]->isValidForUpdate == false ) {
                trigger_error( 'Property ' . $property . ' of the ' . $this->entityLogicalName
                               . ' entity cannot be set', E_USER_NOTICE );

                return;
            }

               (
                   [Value] => AlexaCRM\CRMToolkit\OptionSetValue Object
                       (
                           [value] => 0
                           [label] => Open
                       )

                   [Changed] => 
               )

               (
                   [Value] => AlexaCRM\CRMToolkit\OptionSetValue Object
                       (
                           [value] => 5
                           [label] => Completed
                       )

                   [Changed] => 1
               )

            [statecode] => Array
                (
                    [Value] => AlexaCRM\CRMToolkit\OptionSetValue Object
                        (
                            [value] => 1
                            [label] => Completed
                        )

                    [Changed] => 1
                )