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The error message states:
add_message_files() directory not found: /home/liu/testpkg/src/learning_topic/msg
Does a directory called msg
exist in /home/liu/testpkg/src/learning_topic
?
What is the output of ls -al /home/liu/testpkg/src/learning_topic/msg
?
Call Stack (most recent call first): learning_topic/CMakeLists.txt:80 (add_message_files)
As a check: can you show us the lines in your CMakeLists.txt
around line 80?