# Installation issues **URL:** \ **Category:** ITensor Julia Questions\ **Tags:** julia, installing, cluster\ **Created:** [April 21, 2022, 9:51am UTC](https://itensor.discourse.group/t/installation-issues/62 "2022-04-21T09:51:21Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![scapponi](https://yyz2.discourse-cdn.com/free1/user_avatar/itensor.discourse.group/scapponi/32/472_2.png) [@scapponi](https://itensor.discourse.group/u/scapponi)\ **Post date:** [April 21, 2022, 9:51am UTC](https://itensor.discourse.group/t/installation-issues/62/1 "2022-04-21T09:51:21Z")
I am trying to install the Julia version on some supercomputer . In order to have a local installation, I need to use some local environments using: ```julia import Pkg; Pkg.activate("ITensors") ``` Then I do a standard installation using: ```julia import Pkg; Pkg.add("ITensors") using ITensors ITensors.compile() ``` Then, if I try to create simple tensors everything is fine but I cannot run the basic dmrg examples due to errors, e.g. ```julia julia> OpSum() ERROR: UndefVarError: OpSum not defined Stacktrace: [1] top-level scope at REPL[4]:1 ``` I am beginner in Julia so it might be a stupid mistake… Any help would be appreciated, thanks in advance. ---
**Author:** ![mtfishman](https://yyz2.discourse-cdn.com/free1/user_avatar/itensor.discourse.group/mtfishman/32/11_2.png) [@mtfishman](https://itensor.discourse.group/u/mtfishman)\ **Post date:** [April 21, 2022, 12:28pm UTC](https://itensor.discourse.group/t/installation-issues/62/2 "2022-04-21T12:28:11Z")
In the same Julia session, did you execute `using ITensors` before executing `OpSum()`? For example: ```julia-repl $ julia _ _ _ _(_)_ | Documentation: https://docs.julialang.org (_) | (_) (_) | _ _ _| |_ __ _ | Type "?" for help, "]?" for Pkg help. | | | | | | |/ _` | | | | |_| | | | (_| | | Version 1.7.2 (2022-02-06) _/ |\ __'_|_|_|\__'_| | Official https://julialang.org/ release |__/ | julia> OpSum() ERROR: UndefVarError: OpSum not defined Stacktrace: [1] top-level scope @ REPL[1]:1 julia> using ITensors julia> OpSum() OpSum: julia> ``` ---
**Author:** ![scapponi](https://yyz2.discourse-cdn.com/free1/user_avatar/itensor.discourse.group/scapponi/32/472_2.png) [@scapponi](https://itensor.discourse.group/u/scapponi)\ **Post date:** [April 21, 2022, 12:48pm UTC](https://itensor.discourse.group/t/installation-issues/62/3 "2022-04-21T12:48:46Z")
yes indeed and if I type something else: ```julia sites = siteinds("S=1/2",10; conserve_qns=true) ``` it works perfectly. Actually in my local installation, the content of the `.julia/packages` is not the same as on my laptop so I’m wondering if the installation was done correctly. Is there another way to install ITensor with Julia ? ---
**Author:** ![mtfishman](https://yyz2.discourse-cdn.com/free1/user_avatar/itensor.discourse.group/mtfishman/32/11_2.png) [@mtfishman](https://itensor.discourse.group/u/mtfishman)\ **Post date:** [April 21, 2022, 12:55pm UTC](https://itensor.discourse.group/t/installation-issues/62/4 "2022-04-21T12:55:17Z")
Does the installation work if you skip the step of making a local environment? To do a basic installation of ITensors.jl, all you have to do is: ```julia-repl $ julia _ _ _ _(_)_ | Documentation: https://docs.julialang.org (_) | (_) (_) | _ _ _| |_ __ _ | Type "?" for help, "]?" for Pkg help. | | | | | | |/ _` | | | | |_| | | | (_| | | Version 1.7.2 (2022-02-06) _/ |\ __'_|_|_|\__'_| | Official https://julialang.org/ release |__/ | julia> import Pkg; Pkg.add("ITensors") Updating registry at `~/.julia/registries/General` Updating git-repo `https://github.com/JuliaRegistries/General.git` Resolving package versions... Updating `~/.julia/environments/v1.7/Project.toml` [9136182c] + ITensors v0.3.9 No Changes to `~/.julia/environments/v1.7/Manifest.toml` julia> using ITensors julia> OpSum() OpSum: julia> sites = siteinds("S=1/2",10; conserve_qns=true) 10-element Vector{Index{Vector{Pair{QN, Int64}}}}: (dim=2|id=824|"S=1/2,Site,n=1") 1: QN("Sz",1) => 1 2: QN("Sz",-1) => 1 [...] ``` Does that work for you? If so, the issues you are seeing are probably related to making the local environment, which we can try to help with but I just want to check first that the basic installation process works for you. ---
**Author:** ![scapponi](https://yyz2.discourse-cdn.com/free1/user_avatar/itensor.discourse.group/scapponi/32/472_2.png) [@scapponi](https://itensor.discourse.group/u/scapponi)\ **Post date:** [April 21, 2022, 1:08pm UTC](https://itensor.discourse.group/t/installation-issues/62/5 "2022-04-21T13:08:32Z")
No if I do that, I get this error: ```julia ERROR: SystemError: opening file "/usr/local/julia/julia-1.5.3/local/share/julia/environments/v1.5/Project.toml": Permission denied ``` since I cannot install in the /usr directory. So I do need to activate some local environment… ---
**Author:** ![mtfishman](https://yyz2.discourse-cdn.com/free1/user_avatar/itensor.discourse.group/mtfishman/32/11_2.png) [@mtfishman](https://itensor.discourse.group/u/mtfishman)\ **Post date:** [April 21, 2022, 1:15pm UTC](https://itensor.discourse.group/t/installation-issues/62/6 "2022-04-21T13:15:22Z")
I see, are you using a pre-installed version of Julia on a cluster? I would recommend installing your own version of Julia. First of all, Julia 1.5.3 is pretty old right now and the latest versions of ITensors.jl (after ITensors 0.3) have dropped support for Julia 1.5 and below. Second, it will make it easier for you to install your own packages without having to mess with environments. You should be able to follow the instructions here: [Installing Julia and ITensor · ITensors.jl](https://itensor.github.io/ITensors.jl/stable/getting_started/Installing.html) to install your own local version of Julia on a cluster. ---
**Author:** ![scapponi](https://yyz2.discourse-cdn.com/free1/user_avatar/itensor.discourse.group/scapponi/32/472_2.png) [@scapponi](https://itensor.discourse.group/u/scapponi)\ **Post date:** [April 21, 2022, 1:46pm UTC](https://itensor.discourse.group/t/installation-issues/62/7 "2022-04-21T13:46:37Z")
Thanks a lot, it seems to work now ! ---
**Author:** ![mtfishman](https://yyz2.discourse-cdn.com/free1/user_avatar/itensor.discourse.group/mtfishman/32/11_2.png) [@mtfishman](https://itensor.discourse.group/u/mtfishman)\ **Post date:** [April 21, 2022, 2:01pm UTC](https://itensor.discourse.group/t/installation-issues/62/8 "2022-04-21T14:01:50Z")
Great, glad that worked!