Dear firedrake manager,

   

      I failed to install the firedrake even though I reinstalled python latest and firedrake.

      python3 and firedrake seem to run well. But when I ran "the Simple Helmholtz equation" on introductory tutorials, "NameError: name 'UnitSquareMesh' is not defined" appeared. 

   Would you help me?

   

   Thank you for the help you can provide.

    Regards,

   

   Junho