report Not Solved/No Solution Exists when scip solver found a feasible solution already

[ben-xj]

For SCIP only, it report Not Solved/No Solution Exists when the solver found a feasible solution already. CBC and Cplex works fine.

i can see from scip output that a feasible solution is found:

SCIP Status : solving was interrupted [time limit reached] Solving Time (sec) : 60.00 Solving Nodes : 458 Primal Bound : -1.69680949699402e+06 (4 solutions) Dual Bound : -3.19371571353679e+06 Gap : 88.22 %

What did you do?

code:

solver = pulp.SCIP(msg=True, keepFiles=False, timeLimit=60)
self.model.solve(solver)
log.info(f'Status: {pulp.LpStatus[self.model.status]}')
status = pulp.LpSolution[self.model.sol_status]
log.info(f'Solution status: {status}')

What did you expect to see?

The best solution at the timelimit.

What did you see instead?

Not Solved/No Solution Exists

Useful extra information

The info below often helps, please fill it out if you're able to. :)

What operating system are you using?

• [ ] Windows: ( version: ___ )
• [ ] Linux: ( distro: ___ )
• [x] Mac OS: ( version: ___ )
• [ ] Other: ___

I'm using python version:

• [ ] 2.7
• [ ] 3.4
• [ ] 3.5
• [ ] 3.6
• [x] Other: 3.9

I installed PuLP via:

• [x] pypi (python -m pip install pulp)
• [ ] github (python -m pip install -U git+https://github.com/coin-or/pulp)
• [ ] Other: ___ (conda?)

Did you also

• [ ] Tried out the latest github version: https://github.com/coin-or/pulp
• [x] Searched for an existing similar issue: https://github.com/coin-or/pulp/issues?utf8=%E2%9C%93&q=is%3Aissue%20