runtime error: Json::Value::operator[](char const*)const: requires objectValue

[smolkaj]

The following program compiles fine, but simple_switch raises the error

terminate called after throwing an instance of 'std::runtime_error'
  what():  in Json::Value::operator[](char const*)const: requires objectValue
Aborted (core dumped)

at runtime:

#include <core.p4>
#include <v1model.p4>
typedef standard_metadata_t std_meta_t;

header hash_t {
    bit<16> hash;
}

header ipv4_t {
    bit<32> lkp_ipv4_sa;
}

struct M {
    hash_t hash;
    ipv4_t ipv4;
}

struct H { }


parser ParserI(packet_in pk, out H hdr, inout M meta, inout std_meta_t std_meta) {
    state start {
        transition accept;
    }
}

control VerifyChecksumI(in H hdr, inout M meta) {
    apply { }
}

control ComputeChecksumI(inout H hdr, inout M meta) {
    apply { }
}

control IngressI(inout H hdr, inout M meta, inout std_meta_t std_meta) {

    action a() {
        hash(meta.hash.hash,
             HashAlgorithm.crc16,
             (bit<16>)0, 
             { meta.ipv4.lkp_ipv4_sa },
             (bit<32>)65536);
    }
    
    apply {
        a();
    }
}


control EgressI(inout H hdr, inout M meta, inout std_meta_t std_meta) {
    apply { }
}

control DeparserI(packet_out b, in H hdr) {
    apply { }
}

V1Switch(ParserI(), VerifyChecksumI(), IngressI(), EgressI(), ComputeChecksumI(), DeparserI()) main;

[smolkaj]

This is fixed (I lost track which pull request fixed it, unfortunately.)