variables with unit °C prime 3.1

Hello,

I need some help regarding the unit °C in prime 3.1. In fact, when I extract the variable " Tjmax_D367" from an excel table created in Prime3.1 and when I want to define its unit which is °C, It doesn't work. The error is: "This value must be a scalar or a matrix"

When I try it with the other variables extracted, it doesn't work too even if  The unit "V" and "K/W" work fine.

I will really appreciate your help,

Thanks in advance.

Best regards,

Nadia