View Compilation Error

0_0_39557993_1267.cpp: In member function 'Matrix Matrix::Matrix_qpow(ll)':
0_0_39557993_1267.cpp:68:36: error: 'base' was not declared in this scope
   68 |                 Matrix A(a), ans = base;
      |                                    ^~~~
0_0_39557993_1267.cpp: In member function 'Matrix Matrix::Matrix_inv()':
0_0_39557993_1267.cpp:79:36: error: 'base' was not declared in this scope
   79 |                 Matrix A(a), ans = base;
      |                                    ^~~~