H5 application fails to load: System busy. Please try again later.

Fault symptoms

When you open an H5 application, the iOS container displays an error page with the message "System busy. Please try again later.", as shown in the following figure:

Troubleshooting

First, confirm that there are no RPC 7XXX errors or other errors in the console.

You may see a message in the console that is not directly related to the error. For example:

2020-03-10 18:17:31.162906+0800 Demo[20009:1161503] alipay.openservice.mini.info.detail,cdn:0,etag:0 spdy:0 h2:1 0-Response:
{
    memo = "Missing operation type or this operation type is not supported";
    resultStatus = 3000;
    tips = "Sorry, the operation cannot be performed at the moment. Please try again later.";
}

The URL loaded by the H5 container is: https://render.alipay.com/p/s/tinyapperror/?appId=10200001&errorCode=1001.

This issue can occur for the following reasons:

• The provided App ID is incorrect.

• The offline package has not been published in the console.

• The client version is not within the supported version range of the offline package.

Resolution

1. Confirm that an offline package with a Published status exists in the console.

2. Confirm that the appId provided in the project code is correct:

3. Confirm that the Product Version in the project's info.plist file is within the supported version range for the offline package:

Click here to download a code sample that contains the error.