how to fix?

[appasaheb4]

TypeError: Cannot read property '3' of undefined

var parsed = hl7.parseString(
txtDataReceivefromInstrument
)
console.log({parsed});

                              var tr = hl7.translate(hl7.parseString(txtDataReceivefromInstrument));
                              const result =   assert.equal('185L29839X64489JLPF', parsed[3][3][0][0]);
                              console.log({ result })