OK, that got rid of the first error,
Now Ii get the fallowing

[1] 09:47:09 Translation Notification
[Modelica.Fluid.Interfaces: 529:19-531:49]: From here:

[2] 09:47:09 Translation Error
[BlowDown: 2:3-2:160]: component tank contains the definition of a partial class Medium.
Please redeclare it to any package compatible with Modelica.Media.Interfaces.PartialMedium.

[3] 09:47:09 Translation Error
Error occurred while flattening model BlowDown


I want to define the standard water model.

New user here.   I am trying to do a simple fluid problem with a tank, into a pipe, then valve, than pipe, and into a fixed boundary.   I am having trouble figuring out how to define the media and I get the following errors when I test the model.

[1] 08:51:27 Translation Warning
[Modelica.Fluid.Interfaces: 528:7-528:61]: No corresponding 'inner' declaration found for component .Modelica.Fluid.System tank.system declared as 'outer '.
  The existing 'inner' components are:
    There are no 'inner' components defined in the model in any of the parent scopes of 'outer' component's scope: Modelica.Fluid.Vessels.OpenTank.
  Check if you have not misspelled the 'outer' component name.
  Please declare an 'inner' component with the same name in the top scope.
  Continuing flattening by only considering the 'outer' component declaration.

[2] 08:51:27 Translation Notification
[Modelica.Fluid.Interfaces: 529:19-531:49]: From here:

[3] 08:51:27 Translation Error
[BlowDown: 2:3-2:160]: component tank contains the definition of a partial class Medium.
Please redeclare it to any package compatible with Modelica.Media.Interfaces.PartialMedium.

[4] 08:51:27 Translation Error
Error occurred while flattening model BlowDown