For assistance, contact iTunes Support at www.apple.com/support/ itunes/ww/.

To "solve it," do this:

To contact iTunes Support, do this: 

1. Click on this link --> Choose your country or region - Official Apple Support  

2. Select your country

3. Select: Billing & Subscriptions

4. Select: Subscriptions & Purchases

5. Select: Update payment method

6. Select a chat session or a phone call.

Copied from iTunes support - Apple Community

The people on these boards are mostly other customers and won't know why you're getting that message. Click here and ask Apple Support for assistance.

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Please provide more information about your issue. What were you doing prior to the error message? Is there any other information shown in the error message?

lilyadrianne wrote:

am unable to download app

Tap the link in the reply just above your’s.

am unable to download app