Deep Intercostal/Oblique Pain

betrayed one arm db rows and switched to lat pulldownz for a while (one months),
(did this because I have a dynamic job so I need to have my low back fresh,not too tired)
well,after one session of db row the day after (and now) I feel a deep pain in my intercostals/obliqui muscle,even If I walk I feel it.
I do rows with one knee,hand on the bench.
any tips?

thanx

MdA