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You can't set k to 0,

Andy,

Thanks for your suggestions.

I uploaded a modified version of my schematic, "IPT_LM_modified.zip" in which I have solved the syntax error.

When I rerun the simulation, I encounter a "singular matrix" error.
I read that this error occurs when a part of the circuit floats. However, my circuit is grounded.

Is there something else that triggers this particular error?

Regarding Jerry Lee Marcel's note: if one doesn't define the mutual inductances (and leakage inductances, which I did not apply in my circuit), how would this change my circuit? But this as a side note.

Elien