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
_____