Sketch using IRsend fails to compile

[jofr-kr]

Hi, using IDE 2.3.2 on Windows 10 compiling sketch failed with output:
**C:\Users\xxx\AppData\Local\Temp\cc4iaQUa.ltrans0.ltrans.o: In function IRsend': C:\Users\xxx\Documents\Arduino\libraries\DigisparkIRLib/IRLib.h:286: undefined reference to IRsendBase::IRsendBase()'
C:\Users\xxx\AppData\Local\Temp\cc4iaQUa.ltrans0.ltrans.o: In function loop': C:\Users\xxx\Documents\Arduino\MyTestIRonDigispark/MyTestIRonDigispark.ino:91: undefined reference to IRsend::send(IRTYPES, unsigned long, int)'
collect2.exe: error: ld returned 1 exit status

exit status 1

Compilation error: exit status 1**

Any idea why? Thanks for any idea Jo
Sketch is
MyTestIRonDigispark.txt