Thanks Gianluca! It has saved my afternoon so that I can watch Serie A matches later!
Remove one level of curly braces in your specification of Ticks:
Ticks
Ticks -> {{0.835484 (60. + 1.19691 \[Gamma])}, Automatic}
The way you did it, Mathematica was expectig a couple {position,label}, and if only found {position}.
{position,label}
{position}
