How to make reccurent payment with paypal

Question

Hello, ok i take a look to this article: https://developer.paypal.com/docs/subscriptions/

As i see paypal provide ready made SDK .NET Project which i download and i run it. Here they provide a option to create Billing Plan with product which is used for subscription as i understand. With this function i create a product plan and recive this  id: P-1FM52925BU386645MF32EE4A

Then i create new simple html page and add standard subscribe button with this code:

<script src="https://www.paypal.com/sdk/js?client-id=[sandbox-client-id]&vault=true">
</script>

<div id="paypal-button-container"></div>

<script>
paypal.Buttons({

createSubscription: function (data, actions) {

return actions.subscription.create({

'plan_id': 'P-1FM52925BU386645MF32EE4A'

});

},


onApprove: function (data, actions) {

alert('You have successfully created subscription ' + data.subscriptionID);

},

onError: function (err) {
// Show an error page here, when an error occurs
alert('Here is error: '+ err);
},

onCancel: function (data) {
// Show a cancel page, or return to cart
}


}).render('#paypal-button-container');

</script>

Then i can see the subscribe button and if i click i recive an error like in the image below:

It seems like he cannot find the plan, but if use SDK .NET project to get all plans i can see that the plan exist.

Also i take a look in my developer account in API calls section and i can see this:

There are some warning probably becasue of the error i see after clickin subscribe button but without any explanation. At this image we can see that the billing plan is created succesfully.

Can you please help me what is wrong?