Hi Francisco,
Under Settings > The Events Calendar do you have the “debug” checkbox turned on? as per this screenshot http://f.jkudi.sh/DEFJ?
If yes, then the log entries you are seeing are perfectly normal, since you are asking the plugin to log. Although your particular log/message is in spanish, I was able to tell that it just says “the plugin is starting” which is part of what it logs with the “debug” mode on. As long as you are not seeing actual error messages here, then everything is working properly. If you want these messages to stop appearing in your logs, simply turn off the “debug” mode.
Let us know if you need additional help or if you have any additional questions.