Running tests yields error of cbc solver

[victoraalves]

Hello,

When running some of tests, I have problems with the cbc solver:

ERROR pyomo.opt:solvers.py:588 Solver (cbc) returned non-zero return code (-6)
========================================================== short test summary info ===========================================================
FAILED test_equations.py::test_total_cost - pyomo.common.errors.ApplicationError: Solver (cbc) did not exit normally
FAILED test_equations.py::test_annual_co2 - pyomo.common.errors.ApplicationError: Solver (cbc) did not exit normally
FAILED test_equations.py::test_objective_from_capacity - pyomo.common.errors.ApplicationError: Solver (cbc) did not exit normally
FAILED test_equations.py::test_objective_from_energy - pyomo.common.errors.ApplicationError: Solver (cbc) did not exit normally