# Can't run Pluto
**URL:** https://discourse.julialang.org/t/cant-run-pluto/60907
**Category:** Pluto
**Tags:** pluto
**Created:** [May 10, 2021, 6:02pm UTC](https://discourse.julialang.org/t/cant-run-pluto/60907 "2021-05-10T18:02:15Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@jzr](https://discourse.julialang.org/u/jzr)
#### Post date: [May 10, 2021, 6:02pm UTC](https://discourse.julialang.org/t/cant-run-pluto/60907/1 "2021-05-10T18:02:15Z")
I can’t run Pluto:
```julia
[c3e4b0f8] Pluto v0.14.5
julia version 1.5.4
using Pluto
Pluto.run()
ERROR: LoadError: ArgumentError: invalid base 10 digit 'n' in "null"
Stacktrace:
[1] tryparse_internal(::Type{Int64}, ::String, ::Int64, ::Int64, ::Int64, ::Bool) at /nix/store/33xjx0n6r2v7g079xb1d63i00b3s609k-julia-1.5.4/lib/julia/sys.so:?
[2] parse(::Type{Int64}, ::String; base::Nothing) at /nix/store/33xjx0n6r2v7g079xb1d63i00b3s609k-julia-1.5.4/lib/julia/sys.so:?
[3] parse at ./parse.jl:238 [inlined]
[4] default_number_of_threads() at .julia/packages/Pluto/yDJcG/src/Configuration.jl:91
[5] Pluto.Configuration.CompilerOptions() at ./none:0
[6] field_default at ./none:0 [inlined]
[7] field_defaults(::Type{Pluto.Configurat .julia/packages/Configurations/S1RPp/src/reflection.jl:17
[8] from_dict_validat .julia/packages/Configurations/S1RPp/src/parse.jl:106
[9] from_kwargs(::typeof(Configurat .julia/packages/Configurations/S1RPp/src/parse.jl:74
[10] from_kwargs at .julia/packages/Configurations/S1RPp/src/parse.jl:72 [inlined]
[11] #from_field_kwargs#8 at .julia/packages/Configurations/S1RPp/src/parse.jl:96 [inlined]
[12] from_field_kwargs at .julia/packages/Configurations/S1RPp/src/parse.jl:96 [inlined]
[13] #from_flat .julia/packages/Pluto/yDJcG/src/Configuration.jl:117 [inlined]
[14] from_flat .julia/packages/Pluto/yDJcG/src/Configuration.jl:117 [inlined]
[15] #run#224 at .julia/packages/Pluto/yDJcG/src/webserver/WebServer.jl:87 [inlined]
[16] run() at .julia/packages/Pluto/yDJcG/src/webserver/WebServer.jl:87
[17] top-level scope at src/experiments/web/src/wgl01.jl:3
in expression starting at src/experiments/web/src/wgl01.jl:3
```
---
### Author:  [@miguelraz](https://discourse.julialang.org/u/miguelraz)
#### Post date: [May 11, 2021, 6:17pm UTC](https://discourse.julialang.org/t/cant-run-pluto/60907/2 "2021-05-11T18:17:44Z")
Can you try using Julia 1.6?
---
### Author:  [@jzr](https://discourse.julialang.org/u/jzr)
#### Post date: [May 11, 2021, 7:44pm UTC](https://discourse.julialang.org/t/cant-run-pluto/60907/3 "2021-05-11T19:44:58Z")
Yes that works. Is there a compatibility policy?
---
### Author:  [@lungben](https://discourse.julialang.org/u/lungben)
#### Post date: [May 11, 2021, 8:19pm UTC](https://discourse.julialang.org/t/cant-run-pluto/60907/4 "2021-05-11T20:19:19Z")
It should be compatible with Julia 1.0 to 1.6. See [Pluto.jl/Test.yml at main · fonsp/Pluto.jl · GitHub](https://github.com/fonsp/Pluto.jl/blob/main/.github/workflows/Test.yml)
Did you use a 32 bit version? I think only 64 bit versions are supported.
---
### Author:  [@JanKap](https://discourse.julialang.org/u/JanKap)
#### Post date: [December 28, 2021, 11:27pm UTC](https://discourse.julialang.org/t/cant-run-pluto/60907/5 "2021-12-28T23:27:30Z")
Experienced the same issue today with Julia 1.7.1:
```julia
julia> Pluto.run()
ERROR: ArgumentError: invalid base 10 digit 'a' in "auto"
```
I think, it has to do with my environmental variables:
```julia
julia> ENV["JULIA_NUM_THREADS"]
"auto"
```
Setting it to `4` or any other number works.