Informix Error -16391: Internal error - attempt to highlight invalid line number.

Reasons / Common Causes

-16391 fires when the Debugger attempts to highlight a line number that isn't valid — per the official guidance, this is an internal error.

1. An unexpected internal condition while highlighting a source line, per the official guidance — no further user-actionable detail is given.

Solutions / Resolution

1. Repeat the command, per the official guidance.
2. If the error recurs, note all circumstances and contact IBM Informix Technical Support, per the official guidance.

Examples

N/A

No specific triggering statement is documented — this is reported as an internal error.

Diagnostic Checks

1. Retry the command, and note the exact circumstances if it recurs.

Related Errors / Related Topics

• -16319 — "Internal error - illegal command." A related internal-error code, for a different unexpected parser condition.
• -16334 — "Internal error - null keyword encountered." A related internal-error code, for a different unexpected parser condition.

The Debugger tried to highlight an invalid line number — retry the command, and escalate if it recurs.