only created a dot file not pdf file

[momo462]

/usr/bin/python /Users/momo/Library/Application Support/Developer/Shared/Xcode/Plug-ins/ObjectGraph.xcplugin/Contents/Resources/objc_dep.py /Users/momo/xuexi/LearnMantle -o LearnMantle.dot

number of imports

0 | ****
1 | *******
2 | ***
3 |
4 |
5 | *

0 | Mantle, Mantle-dummy, Pods-LearnMantle-dummy, metamacros
1 | AppDelegate, EXTKeyPathCoding, EXTRuntimeExtensions, MTLReflection, MTLTransformerErrorHandling, ViewController, main
2 | EXTScope, MTLModel, MTLValueTransformer
3 |
4 |
5 | MTLJSONAdapter

times the class is imported

0 |
1 | ****
2 | ****
3 | **

0 |
1 | EXTRuntimeExtensions, EXTScope, MTLJSONAdapter, ViewController
2 | AppDelegate, MTLModel, MTLValueTransformer, metamacros
3 | MTLReflection, MTLTransformerErrorHandling

/bin/zsh -l -c which dot

dot not found

dot not found -Tpdf LearnMantle.dot -o LearnMantle.pdf

launch path not accessible
/bin/mv LearnMantle.pdf /Users/momo/xuexi/LearnMantle

mv: rename LearnMantle.pdf to /Users/momo/xuexi/LearnMantle/LearnMantle.pdf: No such file or directory

/bin/mv LearnMantle.dot /Users/momo/xuexi/LearnMantle

mv: LearnMantle.dot and /Users/momo/xuexi/LearnMantle/LearnMantle.dot are identical

/usr/bin/open LearnMantle.pdf

The file /Users/momo/xuexi/LearnMantle/LearnMantle.pdf does not exist.