In the server log spamming many times error

2018-02-24 12:30:35 ERROR: SPELL: no unit target for spell ID 27267
2018-02-24 12:30:35 ERROR: SPELL: no unit target for spell ID 27269
2018-02-24 12:30:35 ERROR: SPELL: no unit target for spell ID 27269
2018-02-24 12:30:35 ERROR: SPELL: no unit target for spell ID 27267
2018-02-24 12:30:35 ERROR: SPELL: no unit target for spell ID 27269
2018-02-24 12:30:35 ERROR: SPELL: no unit target for spell ID 27269

I looked at this error IMPA warlock.
but I don't know how to solve it