# KernelError Errors from the Bitcoin kernel C API. ``` enum KernelError ``` ## Overview The kernel C API is deliberately minimal: `btck_*_create` functions return `NULL` on failure with no error code, no message, and no way to distinguish causes programmatically. [`KernelError`](/documentation/BitcoinKernel/KernelError) preserves the only information the C API actually provides — which call failed — and invites callers to re-run under a [`LoggingConnection`](/documentation/BitcoinKernel/LoggingConnection) to see the underlying reason in kernel log output.