type inference error:
Error: 
unification error: incompatible shape of terms (subst {})
  unifying `int → prop:type` and `prop:type`
  at file '/home/simon/workspace/zipperposition/../TPTP-v6.1.0/Problems/HWV/HWV114=1.p': line 2571, col 8 to line 2572, col 19
at file '/home/simon/workspace/zipperposition/../TPTP-v6.1.0/Problems/HWV/HWV114=1.p': line 2571, col 8 to line 2572, col 19
Raised at file "src/core/TypeInference.ml", line 51, characters 8-25
Called from file "src/core/TypeInference.ml", line 797, characters 2-35
Called from file "src/core/TypeInference.ml", line 595, characters 14-36
Called from file "src/core/TypeInference.ml", line 796, characters 10-30
Called from file "src/core/TypeInference.ml", line 626, characters 21-39
Called from file "src/core/TypeInference.ml", line 183, characters 14-18
Re-raised at file "src/core/TypeInference.ml", line 188, characters 6-13
Called from file "src/core/TypeInference.ml" (inlined), line 439, characters 2-55
Called from file "src/core/TypeInference.ml", line 624, characters 6-291
Called from file "src/core/TypeInference.ml", line 804, characters 12-27
Re-raised at file "src/core/TypeInference.ml", line 809, characters 4-11
Called from file "src/core/TypeInference.ml", line 828, characters 11-26
Called from file "src/core/TypeInference.ml", line 1110, characters 14-34
Called from file "src/core/TypeInference.ml", line 1142, characters 21-53
Called from file "queue.ml", line 121, characters 6-15
Called from file "src/Iter.ml" (inlined), line 76, characters 17-22
Called from file "src/core/TypeInference.ml", line 1139, characters 2-198
Called from file "src/core/TypeInference.ml", line 1153, characters 6-115