2017-06-01T07_13_04_725Z-debug.log

0 info it worked if it ends with ok
1 verbose cli [ 'C:\\Program Files\\nodejs\\node.exe',
1 verbose cli   'C:\\Users\\myname\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli   'i',
1 verbose cli   '\\\\path\\to\\my\\package\\dir' ]
2 info using npm@5.0.0
3 info using node@v7.0.0
4 silly install loadCurrentTree
5 silly install readLocalPackageData
6 silly pacote directory manifest for undefined@file://path/to/my/package/dir fetched in 24ms
7 silly install loadIdealTree
8 silly install cloneCurrentTreeToIdealTree
9 silly install loadShrinkwrap
10 silly fetchPackageMetaData error for ag-grid-new@file:file:\path\to\my\package\dir Could not install from "file:\path\to\my\package\dir" as it does not contain a package.json file.
11 verbose stack Error: ENOENT: no such file or directory, open 'c:\MyProjects\MyApp\file:\path\to\my\package\dir\package.json'
12 verbose cwd c:\MyProjects\MyApp
13 verbose Windows_NT 10.0.10586
14 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Users\\sflint\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "i" "\\\\path\\to\\my\\package\\dir"
15 verbose node v7.0.0
16 verbose npm  v5.0.0
17 error code ENOLOCAL
18 error Could not install from "file:\path\to\my\package\dir" as it does not contain a package.json file.
19 verbose exit [ 1, true ]

Deleting package-lock.json solved for me.