How do I solve make: None: Command not found issue? - c++

Question

I am having trouble understanding this error.
make: None: Command not found
make: *** [Makefile:3879: api/api_commands.o] Error 127
I have tried looking but I can't find an answer to the specific issue make: None:.
The full issue and error message is here for clarification.
Help on this would be highly appreciated.
Update
The make file consists of the following (line 3879 separated from the rest for clarification):
...
includes_65 = -I../src/tactic/portfolio -I../src/tactic/smtlogics -I../src/ackermannization -I../src/model -I../src/ast/rewriter -I../src/ast -I../src/util -I../src/math/polynomial -I../src/math/automata -I../src/solver -I../src/tactic -I../src/ast/proofs -I../src/sat/sat_solver -I../src/tactic/core -I../src/ast/macros -I../src/ast/normal_forms -I../src/tactic/aig -I../src/tactic/bv -I../src/ast/rewriter/bit_blaster -I../src/tactic/arith -I../src/sat -I../src/sat/tactic -I../src/nlsat/tactic -I../src/nlsat -I../src/smt/tactic -I../src/smt -I../src/cmd_context -I../src/interp -I../src/smt/proto_model -I../src/smt/params -I../src/ast/pattern -I../src/parsers/smt2 -I../src/parsers/util -I../src/ast/substitution -I../src/math/grobner -I../src/math/euclid -I../src/math/simplex -I../src/ast/fpa -I../src/util/lp -I../src/muz/fp -I../src/muz/base -I../src/qe -I../src/muz/pdr -I../src/muz/transforms -I../src/math/hilbert -I../src/muz/dataflow -I../src/muz/clp -I../src/muz/tab -I../src/muz/rel -I../src/muz/bmc -I../src/muz/duality -I../src/duality -I../src/muz/ddnf -I../src/muz/spacer -I../src/tactic/nlsat_smt -I../src/tactic/ufbv -I../src/tactic/fpa -I../src/tactic/sls -I../src/math/subpaving/tactic -I../src/math/subpaving -I../src/math/interval -I../src/math/realclosure -I../src/opt -I../src
api/z3_macros.h.node: ../src/api/z3_macros.h
#echo done > api/z3_macros.h.node
api/z3_api.h.node: ../src/api/z3_api.h
#echo done > api/z3_api.h.node
...
api/api_ast_vector$(OBJ_EXT): ../src/api/api_ast_vector.cpp api/z3.h.node api/api_log_macros.h.node api/api_context.h.node api/api_ast_vector.h.node ast/ast_translation.h.node ast/ast_smt2_pp.h.node
#echo src/api/api_ast_vector.cpp
#$(CXX) $(CXXFLAGS) $(includes_65) $(CXX_OUT_FLAG)api/api_ast_vector$(OBJ_EXT) ../src/api/api_ast_vector.cpp
api/api_bv$(OBJ_EXT): ../src/api/api_bv.cpp api/z3.h.node api/api_log_macros.h.node api/api_context.h.node api/api_util.h.node ast/bv_decl_plugin.h.node
#echo src/api/api_bv.cpp
#$(CXX) $(CXXFLAGS) $(includes_65) $(CXX_OUT_FLAG)api/api_bv$(OBJ_EXT) ../src/api/api_bv.cpp
api/z3_replayer.h.node: ../src/api/z3_replayer.h api/z3.h.node util/z3_exception.h.node
#echo done > api/z3_replayer.h.node
api/api_commands$(OBJ_EXT): ../src/api/api_commands.cpp api/z3.h.node api/z3_replayer.h.node
#echo src/api/api_commands.cpp
#$(CXX) $(CXXFLAGS) $(includes_65) $(CXX_OUT_FLAG)api/api_commands$(OBJ_EXT) ../src/api/api_commands.cpp
api/api_config_params$(OBJ_EXT): ../src/api/api_config_params.cpp api/z3.h.node
...
Since the previous lines in the make file are of similar format and did not cause any errors, the problem must lie within the api_commands.cpp file. I have looked into this file, but I can't understand what is happening in this code exactly, so I cannot interpret where a None variable is created.
The api_commands.cpp file in question is 4856 lines long, but it consists of several functions of ther format
void exec_Z3_params_set_bool(z3_replayer & in) {
Z3_params_set_bool(
reinterpret_cast<Z3_context>(in.get_obj(0)),
reinterpret_cast<Z3_params>(in.get_obj(1)),
in.get_symbol(2),
in.get_bool(3));
}
and a function void register_z3_replayer_cmds(z3_replayer & in) containing lines such as
in.register_cmd(16, exec_Z3_params_set_bool, "Z3_params_set_bool");
If anyone is familiar with such or similar code and would know how this file is creating a None variable, your help would be highly appreciated.