With the switch open, there is no current passing through the current source, which contradicts the fact that it is supplying a nonzero current. Perhaps, instead of a switch in series with the current source short circuiting at the start, you meant to have a switch in parallel with the current source open circuiting at the start?

The circuit isnt wrong but what you have suggested is a improvement of the current source/switch relationship.

MissMulan‭s A current source cannot exist as opened (no load), in the same way a voltage source cannot exist as shorted out. The first will want to generate the specified current and since the impedance is infinite the voltage is infinite; similarly, a voltage source's internal resistance is zero, thus the voltage at the pins ends up divided by zero.