You need to add a statement that defines the coupling between the inductances.
The general form of the statement is
K L1 L2 factor
where L1, L2 are the two inductances to be coupled, factor is the coupling factor. For an ideal transformer factor=1, but a real transformer has losses so factor <1, e.g. 0.95, To get the simulation up and running factor=1 (although not realistic) can be used.
You also need to assign values to all components. R4=R wil not work, C1=C will not work either.
R5, C2 can be omitted since you don't have the 18 kΩ resistor on the transformer's center tap. It seems to be optional as the conenction is dotted in the original schematic.
You have no power supply. The 12 V ned to go to teh center tap of the output transformer. You therefore wil have to split L2 into two inductors L2a, L2b and add the 12 V to the center tap. You will also need to add a coupling factor 'K' for L2a and L2b as these are in the same core.
And again: is this an assignment, homework or similar?