error while compiling. no matching function for call to 'AirGradient::AirGradient()'

[richiepleaserich]

AirGradient-DIY.ino:72:30: error: no matching function for call to 'AirGradient::AirGradient()'
72 | AirGradient ag = AirGradient();
| ^
In file included from G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:6:
\richserver\d\backup\rich\Documents\Arduino\libraries\AirGradient_Air_Quality_Sensor\src/AirGradient.h:27:3: note: candidate: 'AirGradient::AirGradient(BoardType)'
27 | AirGradient(BoardType type);
| ^~~~~~~~~~~
\richserver\d\backup\rich\Documents\Arduino\libraries\AirGradient_Air_Quality_Sensor\src/AirGradient.h:27:3: note: candidate expects 1 argument, 0 provided
\richserver\d\backup\rich\Documents\Arduino\libraries\AirGradient_Air_Quality_Sensor\src/AirGradient.h:25:7: note: candidate: 'constexpr AirGradient::AirGradient(const AirGradient&)'
25 | class AirGradient {
| ^~~~~~~~~~~
\richserver\d\backup\rich\Documents\Arduino\libraries\AirGradient_Air_Quality_Sensor\src/AirGradient.h:25:7: note: candidate expects 1 argument, 0 provided
\richserver\d\backup\rich\Documents\Arduino\libraries\AirGradient_Air_Quality_Sensor\src/AirGradient.h:25:7: note: candidate: 'constexpr AirGradient::AirGradient(AirGradient&&)'
\richserver\d\backup\rich\Documents\Arduino\libraries\AirGradient_Air_Quality_Sensor\src/AirGradient.h:25:7: note: candidate expects 1 argument, 0 provided
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:75:1: error: 'TMP_RH' does not name a type
75 | TMP_RH value_sht;
| ^~~~~~
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino: In function 'void setup()':
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:116:6: error: 'class AirGradient' has no member named 'PMS_Init'
116 | ag.PMS_Init();
| ^~~~~~~~
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:119:6: error: 'class AirGradient' has no member named 'CO2_Init'
119 | ag.CO2_Init();
| ^~~~~~~~
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:122:6: error: 'class AirGradient' has no member named 'TMP_RH_Init'
122 | ag.TMP_RH_Init(0x44);
| ^~~~~~~~~~~
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino: In function 'uint8_t update()':
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:222:20: error: 'class AirGradient' has no member named 'getPM2_Raw'
222 | int value = ag.getPM2_Raw();
| ^~~~~~~~~~
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:236:20: error: 'class AirGradient' has no member named 'getCO2_Raw'
236 | int value = ag.getCO2_Raw();
| ^~~~~~~~~~
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:250:5: error: 'TMP_RH' was not declared in this scope
250 | TMP_RH value = ag.periodicFetchData();
| ^~~~~~
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:251:9: error: 'value' was not declared in this scope
251 | if (value.t != NULL && value.rh != NULL) {
| ^~~~~
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:252:7: error: 'value_sht' was not declared in this scope; did you mean 'value_nox'?
252 | value_sht = value;
| ^~~~~~~~~
| value_nox
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:281:48: error: 'value_sht' was not declared in this scope; did you mean 'value_nox'?
281 | compensationT = static_cast<uint16_t>((value_sht.t + 45) * 65535 / 175);
| ^~~~~~~~~
| value_nox
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino: In function 'String GenerateMetrics()':
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:353:23: error: 'value_sht' was not declared in this scope; did you mean 'value_nox'?
353 | message += String(value_sht.t);
| ^~~~~~~~~
| value_nox
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino: In function 'void updateOLED()':
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:416:26: error: 'value_sht' was not declared in this scope; did you mean 'value_nox'?
416 | ln3 = "F:" + String((value_sht.t * 9 / 5) + 32) + " H:" + String(value_sht.rh) + "%";
| ^~~~~~~~~
| value_nox
G:\projects\airgraident\AirGradient-DIY\AirGradient-DIY.ino:418:25: error: 'value_sht' was not declared in this scope; did you mean 'value_nox'?
418 | ln3 = "C:" + String(value_sht.t) + " H:" + String(value_sht.rh) + "%";
| ^~~~~~~~~
| value_nox

exit status 1

Compilation error: no matching function for call to 'AirGradient::AirGradient()'