Fix a bug

utils/data.py

@@ -355,8 +355,11 @@ class Problem(object):
         self.solutions[solution_id] = solution
 
         if solution.status == 'done':
+            outdir = f"{self.solution_path}/{self.name}"
+            if not os.path.exists(outdir):
+                os.mkdir(outdir)
             problem_path = self.path
-            solution_path = f'{self.solution_path}/{self.name}/tmp-{solution.request_id}-{solution.worker}.txt'
+            solution_path = f'{outdir}/tmp-{solution.request_id}-{solution.worker}.txt'
             with open(solution_path, 'w') as fp:
                 fp.write(solution.solution)