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This is a bug in the library data. I added an issue to the bug tracker to fix it. Until that happens you have two options. You can use the "Packaged Rooftop VAV with Reheat" template, which will insert a valid single speed tower in the condenser loop. If you don't want all of the other stuff that comes with that template you can edit or remove it. The other option is to edit the library data directly by modifying the library file located in C:\Program Files (x86)\OpenStudio 1.5.2\share\openstudio-1.5.2\OSApp\hvaclibrary. If you search that file for "1 Spd Cooling Tower" you will find the object in question. Edit it so that it looks something like this:

OS:CoolingTower:SingleSpeed,
  {6f622c95-b528-4dfc-bab0-e99c7cbea283}, !- Handle
  1 Spd Cooling Tower,           !- Name
  ,                                           !- Water Inlet Node Name
  ,                                           !- Water Outlet Node Name
  autosize,                               !- Design Water Flow Rate {m3/s}
  autosize,                               !- Design Air Flow Rate {m3/s}
  autosize,                               !- Fan Power at Design Air Flow Rate {W}
  autosize,                               !- U-Factor Times Area Value at Design Air Flow Rate {W/K}
  autosize,                               !- Air Flow Rate in Free Convection Regime {m3/s}
  autosize,                               !- U-Factor Times Area Value at Free Convection Air Flow Rate {W/K}
  UFactorTimesAreaAndDesignWaterFlowRate, !- Performance Input Method
  ,                                       !- Nominal Capacity {W}
  0;                                      !- Free Convection Capacity {W}