Arduino demo source code for LoRa "Receiver"

[kendo]

   
i have done these instruction. it doesn't work.
Error Msg in Arduino:
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LoRa_Receicer_KC868:7:10: fatal error: LoRa.h: No such file or directory
#include <LoRa.h>
          ^~~~~~~~
compilation terminated.
exit status 1
LoRa.h: No such file or directory
--------------------------------------------------------------------------------------------

the lib is installed!