We had the same issue. First thing to try is to use two clamps instead of one on the fitting to see if that will tighten it up enough to stop the leak.
If that doesn't work (and it didn't for us), here is another option.
Drain the panel so there is no water coming out of it. Take some silicone seal and smear it on the inside of the hose and also on the fitting and then tighten it up. Put a clamp on it to hold it while it is setting up and let it sit overnight before attempting to put water through it again the next day. That solved it for us.
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