The generator matrix

 1  1  1  1  1  1  1  1
 0  X  0  X a*X a*X a^5*X a^5*X
 0  0  X a^6*X a^2*X a^4*X  X a^2*X

generates a code of length 8 over F8[X]/(X^2) who´s minimum homogenous weight is 48.

Homogenous weight enumerator: w(x)=1x^0+196x^48+3696x^56+203x^64

The gray image is a linear code over GF(8) with n=64, k=4 and d=48.
This code was found by Heurico 1.16 in 0.000611 seconds.