# Installation Error "RollbackFailedOptional"

**URL:** <https://discourse.nodered.org/t/installation-error-rollbackfailedoptional/2298>\
**Category:** General\
**Created:** [15 August 2018 07:09 UTC](https://discourse.nodered.org/t/installation-error-rollbackfailedoptional/2298 "2018-08-15T07:09:03Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Wasif](https://avatars.discourse-cdn.com/v4/letter/w/ebca7d/32.png) [@Wasif](https://discourse.nodered.org/u/Wasif)\
**Post date:** [15 August 2018 07:09 UTC](https://discourse.nodered.org/t/installation-error-rollbackfailedoptional/2298/1 "2018-08-15T07:09:04Z")

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Hi Guys,

I am new to NODE-RED. I am trying to install on my windows and getting the following error.

C:\Users\Administrator\>npm install -g --unsafe-perm node-red  
[..................] / rollbackFailedOptional: verb npm-session d7722200b73ffa4

Can any one guide me or any suggestion ?

Thank

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<div class="post-metadata">

**Author:** ![ukmoose](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/ukmoose/32/13_2.png) [@ukmoose](https://discourse.nodered.org/u/ukmoose)\
**Post date:** [15 August 2018 07:10 UTC](https://discourse.nodered.org/t/installation-error-rollbackfailedoptional/2298/2 "2018-08-15T07:10:12Z")

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What version of Windows?  
What version of nodejs?  
And what version of npm?

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<div class="post-metadata">

**Author:** ![Wasif](https://avatars.discourse-cdn.com/v4/letter/w/ebca7d/32.png) [@Wasif](https://discourse.nodered.org/u/Wasif)\
**Post date:** [15 August 2018 07:26 UTC](https://discourse.nodered.org/t/installation-error-rollbackfailedoptional/2298/3 "2018-08-15T07:26:30Z")

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Hi,

My windows details are as below.  
Windows 7 Ultimate  
64 BIT OS.

Node -v is v8.11.3  
npm -v is v5.6.0

Thanks

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<div class="post-metadata">

**Author:** ![knolleary](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/knolleary/32/3_2.png) [@knolleary](https://discourse.nodered.org/u/knolleary)\
**Post date:** [15 August 2018 07:56 UTC](https://discourse.nodered.org/t/installation-error-rollbackfailedoptional/2298/4 "2018-08-15T07:56:14Z")

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> [@Wasif](#):
>
> rollbackFailedOptional

Have you googled that error? There are lots of results and suggestions already out there for that error - it would save us typing out the same answers here.