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Amir,
I think the error in the simulation is actually the one just beneath the one that you highlighted in the image. The connection issue is just a warning. The message below it says "over specified flows. One (and only one) flow must be entered as -2."
If I am right, that error is generated by Type60, which models a constant volume liquid storage tank that has two inlets and two outlets. The user specifies three of the four flows and the model computes the value of the fourth. The user specifies which one of the four flows is to be calculated by entering that flow rate with the code "-2." I suspect that in your model you might have specified all four of the flow rates.
As a side note, it is HIGHLY recommended that you not use Type60. That model has been shown to have some very serious energy balance issues and has been replaced. It is only included in the present Trnsys version for backwards compatibility reasons. If you are using Trnsys18 you can use either Type156 or 158 in the standard library. If you need a horizontally cylindrical tank model there are a number of them available in the TESS Storage Tank library.
kind regards,
David
