PayPal Express Checkout Error

[industryst]

Hello!
During testing payments transaction by PayPal in my store shop.annagincharenko.com , I got this errors(1,2) and in finally window I saw t "PayPal Express Checkout Error". Money not came to my PayPal account and not came back to my credit card

1) Error: Error in data of page with controller: 'pages/content/content'. Please check for key_value present where key_param was set
2)PayPal Express Checkout Error: This transaction couldn't be completed. Please redirect your customer to PayPal.. Test mode = 0. in /home/vismo/annagoncharenko.com/shop/extensions/default_pp_express/storefront/controller/responses/extension/default_pp_express.php on line 126

How I can correct errors?
Thank you for your help.....

[Basara]

Hello.

Please provide more details.
Do you have this issue with any paypal account or only once?
What is your AbanteCart version?
What is your paypal express extension version?

[industryst]

Hello.

Please provide more details.
Do you have this issue with any paypal account or only once?
What is your AbanteCart version?
What is your paypal express extension version?

Thanks a lot that you pay attention to my problem!
1)I have this problem with any paypal account. I tryed 3 times from 3 diferent credit card and card holder
2)My AbanteCart version is 1.2.1
3)Paypal express extension version is 1.0.3

Now I have only activated "PayPal Express Checkout 1.0.3" and deactivated "Standart PayPal extension 1.0.2"... Maybe Is it might be root of my problem?

[Basara]

Standard Paypal is separate from PayPal express.
Can you please turn ON Sandbox-Test Mode in PayPal express settings and use your paypal sandbox account for testing? This will help to understand why you have issues.