npm rollbackFailedOptional error when install any package

Question

I have a problem when installing any npm packages. here is my error:

rollbackFailedOptional: verb npm-session xxxxxxxxxxx

for resolving this I do some stuff but I still get the same error.

I put registry=http://registry.npmjs.org/ in .npmrc file in my user folder and also run following commands:

npm config rm proxy
npm config rm https-proxy

I try to solve the problem in node 8.11.1 and node 10.1.0 and my npm version is 5.6.0.

Why this problem occurs and how can resolve that?

Update: npm config list:

; cli configs
metrics-registry = "http://registry.npmjs.org/"
scope = ""
user-agent = "npm/5.6.0 node/v8.11.1 win32 x64"

; userconfig C:\Users\me\.npmrc
https-proxy = "https://username:[email protected]:6050/"
proxy = "http://username:[email protected]:6050/"
registry = "http://registry.npmjs.org/"

; builtin config undefined
prefix = "C:\\Users\\me\\AppData\\Roaming\\npm"

; node bin location = C:\Program Files\nodejs\node.exe
; cwd = C:\Users\me
; HOME = C:\Users\me
; "npm config ls -l" to show all defaults.

Answer 1

I had resolved this identical issue by pointing the npm to the correct proxy when using a corporate machine. NO ADMIN REQUIRED!!!

Here are my steps:

1. Obtain the correct proxy by following these steps here! Copy/paste the proxy address into notepad. You will use this same proxy to set both the 'proxy' and 'proxy-https' params in the next step.

2. Execute the following 2 commands in your command window by replacing <contents> below with proxy address obtained in previous step:

   • npm config set proxy http://<proxy-server-url:port>
   • npm config set https-proxy http://<proxy-server-url:port>

NOTE: I ommitted 'username' and 'password' fields from the 'http://<username><password>@<proxy-server-url:port>' template which according to the source should work 9 out of 10 times, and worked perfectly for me.

3. Navigate to your project folder from the command line and execute 'npm install <package name(s)>'. The installation should be successfull.