BoundaryML/baml · critical · BridgeError

Internal error

Error message

Internal error: {0}

What it means

BridgeError::Internal wraps an unexpected internal failure message. It marks bugs or unreachable states in the bridge itself — invariant violations, unexpected engine responses, or wrapped low-level failures — rather than caller mistakes.

Solutions

1. Capture the full wrapped message and report it upstream (BAML issue tracker) — it usually indicates a bug.
2. Re-initialize the runtime (recreate the engine) to clear possibly corrupted state.
3. Ensure bridge_cffi native library and client SDK versions match.
4. Retry once after a clean re-init only if the message suggests transient state.

try:
    result = bridge.operation(...)
except BridgeError as e:
    if 'Internal error' in str(e):
        log.error(e)  # report upstream; re-init engine
        runtime = recreate_runtime()

When it happens

Trigger: Any bridge code path hitting an unexpected condition it formats as Internal(msg); typically engine internals returning data the bridge cannot interpret or a panic-recovered state.

Common situations: Version mismatch between the native bridge and the client SDK; corrupted runtime state after a failed init; genuine bugs in bridge_cffi.

Understand the failure class

Background: "This is a bug, please report it": internal invariant violations, unreachable panics, and SNH errors explained — this error's family across 47 libraries.

Related errors

• __class_getitem__
• internal error
• Internal error
• internal error: cannot convert value
• internal error: cannot convert value

AI-assisted analysis of BoundaryML/baml@bd85ce9dee (2026-09-12). Data as JSON: /api/errors/4a3cbf3d5ed3fc4c. Report an issue: GitHub.

Appendix: source

Thrown at baml_language/crates/bridge_cffi/src/error.rs:43

    #[error("type arguments are not supported when invoking a BAML function handle")]
    FunctionHandleTypeArgs,

    #[error("Function not found: {name}")]
    FunctionNotFound { name: String },

    #[error("Missing argument '{parameter}' for function '{function}'")]
    MissingArgument { function: String, parameter: String },

    #[error("Not implemented: {0}")]
    NotImplemented(String),

    #[error("call_id {0} is already in use by an active call")]
    DuplicateCallId(u64),

    #[error("call_id must be a nonzero uint64")]
    InvalidCallId,

    #[error("Internal error: {0}")]
    Internal(String),

    #[error("{0}")]
    Startup(String),
}

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