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I can try to help you with your errors and the Lowtemperatureradiant object

Lets start with the node connection errors for the radiant floors you need 2 nodes for heating and 2 nodes for cooling. The heating nodes connect to the boiler loop and the cooling nodes connect to the cooling loop. If you don't have cooling you can leave that part of the object blank (you might need to fill in one or two items but the error files will let you know which those are, most importantly keep the cooling node names blank). The radiant object then needs to be listed on the equipment list for each room it is in.

Each radiant object needs to have a branch with the heating nodes and a separate branch with the cooling nodes (if you have cooling). These branches then need to be placed on the demand side of the heating loop for the hot side and the demand side of the cooling loop for the cold side, this is done in the objects Branchlist, Connector:Splitter, Connector:Mixer. (replace were the radiators had been put).

Finally the surfaces that have radiant floors indeed have to have Construction:InternalSource but they also need to be listed on ZoneHVAC:LowTemperatureRadiant:SurfaceGroup. That is the name of the surface and the percentage of that surface in the whole group that is radiant.

I am not sure about your pump flow rate but i would set it to autosize and go from there. it might just be an error because the radiant ceilings aren't connected up correctly.

I have drawn a node connection drawing with branches to try to help you understand how everything goes together.