Compilation error

[Chellux]

hi

bekomm leider beim compilieren immer diese meldung...

In file included from C:\Users\maik-\Downloads\esp8266-co2monitor-master\esp8266-co2monitor\esp8266-co2monitor\esp8266-co2monitor.ino:10:
C:\Users\maik-\Downloads\esp8266-co2monitor-master\esp8266-co2monitor\esp8266-co2monitor\settings.h:9: warning: "PIN_CLK" redefined
9 | #define PIN_CLK 4 //D2 on PCB
|
C:\Users\maik-\Downloads\esp8266-co2monitor-master\esp8266-co2monitor\esp8266-co2monitor\settings.h:1: note: this is the location of the previous definition
1 | #define PIN_CLK D2
|
C:\Users\maik-\Downloads\esp8266-co2monitor-master\esp8266-co2monitor\esp8266-co2monitor\settings.h:10: warning: "PIN_DATA" redefined
10 | #define PIN_DATA 5 //D1 on PCB
|
C:\Users\maik-\Downloads\esp8266-co2monitor-master\esp8266-co2monitor\esp8266-co2monitor\settings.h:2: note: this is the location of the previous definition
2 | #define PIN_DATA D1
|
C:\Users\maik-\Downloads\esp8266-co2monitor-master\esp8266-co2monitor\esp8266-co2monitor\esp8266-co2monitor.ino: In function 'bool decodeDataPackage(byte*)':
C:\Users\maik-\Downloads\esp8266-co2monitor-master\esp8266-co2monitor\esp8266-co2monitor\esp8266-co2monitor.ino:326:1: error: control reaches end of non-void function [-Werror=return-type]
326 | }
| ^
cc1plus.exe: some warnings being treated as errors

exit status 1

Compilation error: control reaches end of non-void function [-Werror=return-type]

was kann ich dagegen tun?