View Compilation Error

0_0_18625727_29419.cs(47,20): error CS0031: Constant value '-1' cannot be converted to a 'byte'
0_0_18625727_29419.cs(47,34): error CS0031: Constant value '-1' cannot be converted to a 'byte'
0_0_18625727_29419.cs(76,8): warning CS0652: Comparison to integral constant is useless; the constant is outside the range of type 'byte'
0_0_18625727_29419.cs(76,25): warning CS0652: Comparison to integral constant is useless; the constant is outside the range of type 'byte'