ESP and DHT22 LOW MEMORY

memory is ok. but rh and temp -1. why?..

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{ "err": true, "checksumError": true,
  "raw": "100000010010100110000000011001000000111­01",
  "temp": -1, "rh": -1 }
{ "free": 1981, "usage": 319, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.969 }
start: Date: Thu Jan 1 1970 00:00:15 GMT+0000 end: Date: Thu Jan 1 1970 00:00:21 GMT+0000 elapsed: 5565.295
_____
{ "err": true, "checksumError": true,
  "raw": "100000010010110110000000011001000001001­01",
  "temp": -1, "rh": -1 }
{ "free": 1981, "usage": 319, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.952 }
start: Date: Thu Jan 1 1970 00:00:25 GMT+0000 end: Date: Thu Jan 1 1970 00:00:31 GMT+0000 elapsed: 5564.528
_____
{ "err": true, "checksumError": true,
  "raw": "100000010010101100000000011001000001000­00",
  "temp": -1, "rh": -1 }
{ "free": 1981, "usage": 319, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.949 }
start: Date: Thu Jan 1 1970 00:00:35 GMT+0000 end: Date: Thu Jan 1 1970 00:00:41 GMT+0000 elapsed: 5549.423
_____
{ "err": true, "checksumError": true,
  "raw": "100000010010101000000000011001000000111­10",
  "temp": -1, "rh": -1 }
{ "free": 1981, "usage": 319, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.953 }
start: Date: Thu Jan 1 1970 00:00:45 GMT+0000 end: Date: Thu Jan 1 1970 00:00:51 GMT+0000 elapsed: 5564.674
_____
{ "err": true, "checksumError": true,
  "raw": "100000010010100110000000011001001000111­10",
  "temp": -1, "rh": -1 }
{ "free": 1972, "usage": 328, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.967 }
start: Date: Thu Jan 1 1970 00:00:55 GMT+0000 end: Date: Thu Jan 1 1970 00:01:01 GMT+0000 elapsed: 5570.317
_____
{ "err": true, "checksumError": true,
  "raw": "100000010010100100000000011001001000111­01",
  "temp": -1, "rh": -1 }
{ "free": 1972, "usage": 328, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.97 }
start: Date: Thu Jan 1 1970 00:01:05 GMT+0000 end: Date: Thu Jan 1 1970 00:01:11 GMT+0000 elapsed: 5568.358
_____
{ "err": true, "checksumError": true,
  "raw": "100000010010100000000000011001001000110­11",
  "temp": -1, "rh": -1 }
{ "free": 1972, "usage": 328, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.964 }
start: Date: Thu Jan 1 1970 00:01:15 GMT+0000 end: Date: Thu Jan 1 1970 00:01:21 GMT+0000 elapsed: 5565.552
_____
{ "err": true, "checksumError": true,
  "raw": "100000010010011100000000011001001000110­01",
  "temp": -1, "rh": -1 }
{ "free": 1972, "usage": 328, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.963 }
start: Date: Thu Jan 1 1970 00:01:25 GMT+0000 end: Date: Thu Jan 1 1970 00:01:31 GMT+0000 elapsed: 5576.903
_____
{ "err": true, "checksumError": true,
  "raw": "100000010010011000000000011001001000101­11",
  "temp": -1, "rh": -1 }
{ "free": 1972, "usage": 328, "total": 2300, "history": 126,
  "gc": 0, "gctime": 1.963 }
start: Date: Thu Jan 1 1970 00:01:35 GMT+0000 end: Date: Thu Jan 1 1970 00:01:41 GMT+0000 elapsed: 5576.975
_____