兄弟，点击运行之后出现这个咋办？

[haoxing49]

Undefined symbols for architecture x86_64:
"_mpv_command", referenced from:
-[PlayerView playVideo:] in PlayerView.o
"_mpv_command_async", referenced from:
-[PlayerControlView nextEP:] in PlayerControlView.o
-[PlayerControlView prevEP:] in PlayerControlView.o
-[PlayerControlView subSwitch:] in PlayerControlView.o
-[PlayerControlView keepAspectSwitch:] in PlayerControlView.o
-[PlayerWindow scrollWheel:] in PlayerWindow.o
___29-[PlayerWindow showMediaInfo]_block_invoke in PlayerWindow.o
-[PlayerWindow keyDown:] in PlayerWindow.o
...
"_mpv_create", referenced from:
-[PlayerView playVideo:] in PlayerView.o
"_mpv_error_string", referenced from:
check_error(int) in PlayerView.o
"_mpv_get_property_async", referenced from:
-[PlayerControlView readInitState] in PlayerControlView.o
-[PlayerControlView updateTime] in PlayerControlView.o
"_mpv_get_property_string", referenced from:
-[PostComment Send:] in PostComment.o
___29-[PlayerWindow showMediaInfo]_block_invoke in PlayerWindow.o
"_mpv_initialize", referenced from:
-[PlayerView playVideo:] in PlayerView.o
"_mpv_observe_property", referenced from:
-[PlayerControlView readInitState] in PlayerControlView.o
"_mpv_request_log_messages", referenced from:
-[PlayerView playVideo:] in PlayerView.o
"_mpv_set_option", referenced from:
-[PlayerView playVideo:] in PlayerView.o
"_mpv_set_option_string", referenced from:
-[PlayerView setMPVOption::] in PlayerView.o
-[PlayerView playVideo:] in PlayerView.o
-[PlayerView loadMPVSettings] in PlayerView.o
"_mpv_set_property_async", referenced from:
-[PlayerControlView setVolume:] in PlayerControlView.o
-[PlayerControlView seekTo:] in PlayerControlView.o
-[PlayerControlView playPause:] in PlayerControlView.o
-[PlayerControlView mute:] in PlayerControlView.o
-[PlayerControlView subSwitch:] in PlayerControlView.o
-[PlayerControlView keepAspectSwitch:] in PlayerControlView.o
-[PlayerWindow toggleFullScreen:] in PlayerWindow.o
...
"_mpv_set_wakeup_callback", referenced from:
-[PlayerView playVideo:] in PlayerView.o
-[PlayerWindow mpv_cleanup] in PlayerWindow.o
"_mpv_terminate_destroy", referenced from:
___27-[PlayerWindow mpv_cleanup]_block_invoke in PlayerWindow.o
"_mpv_wait_event", referenced from:
___24-[PlayerView readEvents]_block_invoke in PlayerView.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)