Custom program error

0x20c88392

Appears in logs as custom program error: 0x20c8

Anchor

Custom error #2392

“custom program error: 0x20c8”

Code 8392 (0x20c8) is not an Anchor framework error. Anchor programs number their own #[error_code] enum starting at 6000, so this is the 2393rd variant (index 2392) of the error enum defined by the program you called.

Common causes

The program's instruction handler returned the error at index 2392 of its custom error enum. What that means depends entirely on the program.

How to fix it

Look at the program logs: Anchor prints Error Code: <Name>. Error Number: 8392. Error Message: <text> just before the failure.
Open the program's IDL (on an explorer or via anchor idl fetch <programId>) and find the errors entry with code 8392.
In the Rust source, count variants in the #[error_code] enum: variant 2392 (zero-based) is the one that fired.

Source definition ↗All Anchor errors →

How Anchor custom error numbers work

Every Anchor program declares its own errors with #[error_code]. Anchor assigns the first variant 6000, the second 6001, and so on, so they never collide with the framework’s own errors (100–5999). The hex you see in logs is simply that number in base 16: 6000 = 0x1770, 6001 = 0x1771, 6002 = 0x1772.

#[error_code]
pub enum MyError {
    #[msg("Amount must be greater than zero")]
    ZeroAmount,          // 6000 = 0x1770
    #[msg("Slippage tolerance exceeded")]
    SlippageExceeded,    // 6001 = 0x1771
    #[msg("Pool is paused")]
    PoolPaused,          // 6002 = 0x1772
}

To find out what 0x20c8 means for the program you called, fetch its IDL and look at the errors array, or look for the Error Message: log line Anchor prints before the failure. The transaction decoder pulls these log lines out of a failed signature for you.

Decode another error

Try:

Nearby codes

0x20c5Custom error #2389 0x20c6Custom error #2390 0x20c7Custom error #2391 0x20c9Custom error #2393 0x20caCustom error #2394 0x20cbCustom error #2395