# The MongoDB\Driver\Exception\RuntimeException class

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Thrown when the driver encounters a runtime error (e.g. internal error from libmongoc).

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        MongoDB\Driver\Exception\RuntimeException

          MongoDB\Driver\Exception\RuntimeException

          extends
          RuntimeException

          MongoDB\Driver\Exception\Exception

        &Properties;

         protected
         arraynull
         errorLabels

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        &Methods;

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`errorLabels`

- Contains an array of error labels to go with an exception. For example, error labels can be used to detect whether a transaction can be retried safely if the `TransientTransactionError` label is present. The existence of a specific error label should be tested for with the `MongoDB\Driver\Exception\RuntimeException::hasErrorLabel`, instead of interpreting this `errorLabels` property manually.

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PECL mongodb 1.6.0 | The `MongoDB\Driver\Exception\RuntimeException::hasErrorLabel` method and MongoDB\Driver\Exception\RuntimeException::errorLabels property have been added.

&reference.mongodb.mongodb.driver.exception.entities.runtimeexception;