public TranslatableMessage getTranslatableMessage() {
        return translatableMessage;
    }
Returns a translatable message describing the error that occurred. If no
translatable message is associated with the error, this will be null.

@return
    A translatable message describing the error that occurred, or null
    if there is no such message defined.
guacamole/src/main/java/org/apache/guacamole/rest/APIError.java