Can't solve port dimension errors in Simulink FOC model

I can't open your model. But from your screenshot I see the following:

• The little numbers at the signal arrows denote how many signals are in this path. I think it should be always 1 (in your model), except for the three-phase currents, where it should be 3. So everywhere you find a 2 something is wrong.
• The probable mistake is, that you Demux the PhaseCur in the lower right corner into only 2 signal paths. For whatever reason it appears that the Clarke transform only demands for the phases a and b, but not c. But instead of dropping c you feed it into the block together with a (or a and b together, with c aside, for that matter). So instead of a 2-Way-Demux before, use a 3-Way-Demux and get rid of phase c before the Clarke transform.

This is the most apparent mistake until now, try if it works.

The documentation of the Clarke transform block states:

The block accepts two signals out of the three phases (abc), automatically calculates the third signal, and outputs the corresponding components in the αβ reference frame. For example, the block accepts a and b input values where the phase-a axis aligns with the α-axis.