# X_OTLP_ENDPOINT_INVALID

## Means

the OTLP collector endpoint is missing or malformed

## Typical cause

`OTEL_EXPORTER_OTLP_ENDPOINT` unset with none passed, a value that is not a URL, a scheme that is not `http`/`https`, or the collector's gRPC receiver on `:4317` — OTLP/HTTP JSON is served on `:4318`, and an exporter pointed at the wrong port drops every batch with a transport error and no metrics

## Fix

`set OTEL_EXPORTER_OTLP_ENDPOINT=http://otel-collector:4318`, or skip the exporter when `tryOtlpEndpoint('<signal>')` is undefined

[Metrics](/error-codes#metrics)