It is occured if the specific data didn't exist.
For instance, there are some mappings. if you want to get storage data of a contract, and if the data of a specific index did't exist, you can see this error.
address[] myaddresses;
// myaddresses[0] -> OK
// myaddresses[1] -> 32603
// It means that the second data don't exist.
| Type | InitValue |
|---|---|
| uint | 0 |
| string | "" |
| address | 0x0 |
| bytes | 0x |