Adding new custom font show square updating unity

Hello friend,

in my unity 5.3.1 have project with custom font when i upgrade it to 5.4.1 custom font is display like Square. i am used roboto font and same project working well with my other pc

Thanks in advance.
sorry for bad English.

80880-font-error.png

Can you please show the inspector values of the material that the Text gameObject is using ? @sanjayMer