# ERROR: MethodError: no method matching pin(::String, ::VersionNumber)
**URL:** https://discourse.julialang.org/t/error-methoderror-no-method-matching-pin-string-versionnumber/19672
**Category:** Visualization
**Tags:** question
**Created:** [January 15, 2019, 5:49pm UTC](https://discourse.julialang.org/t/error-methoderror-no-method-matching-pin-string-versionnumber/19672 "2019-01-15T17:49:18Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@bsnyh](https://discourse.julialang.org/u/bsnyh)
#### Post date: [January 15, 2019, 5:49pm UTC](https://discourse.julialang.org/t/error-methoderror-no-method-matching-pin-string-versionnumber/19672/1 "2019-01-15T17:49:18Z")
I was using Julia 0.7 to install a package JEMSS.jl from this link: [https://github.com/uoa-ems-research/JEMSS.jl](https://github.com/uoa-ems-research/JEMSS.jl)
During the process, I need to use the Julia 0.6 command
“Pkg.pin( “GDAL”, v"0.1.2” )"
But when I tried it. I got an error like the following:
ERROR: MethodError: no method matching pin(::String, ::VersionNumber)
Can anyone point to me how to pin a package to a certain version in Julia 0.7?
Moreover, can I understand that Julia version 0.7 is an intermediate between 0.6 and 1.0? So if is it possible that I can combine code written in Julia 0.6 with package written in Julia 1.0 without too much efforts?
---
### Author:  [@fredrikekre](https://discourse.julialang.org/u/fredrikekre)
#### Post date: [January 15, 2019, 6:41pm UTC](https://discourse.julialang.org/t/error-methoderror-no-method-matching-pin-string-versionnumber/19672/2 "2019-01-15T18:41:48Z")
You can just add the version explicitly (see the [docs](https://julialang.github.io/Pkg.jl/v1/api/)):
```julia
Pkg.add(PackageSpec(name="GDAL", version="0.1.2"))
```
and if you really feel like it you can pin it afterwards:
```julia
Pkg.pin("GDAL")
```
Note that the new package manager does not update as aggressively, so the pin might be superfluous.
---
### Author:  [@bsnyh](https://discourse.julialang.org/u/bsnyh)
#### Post date: [January 15, 2019, 7:26pm UTC](https://discourse.julialang.org/t/error-methoderror-no-method-matching-pin-string-versionnumber/19672/4 "2019-01-15T19:26:10Z")
Just tried the command
Pkg.add(PackageSpec(name=“GDAL”, version=“0.1.2”)) and got an error saying that “PackageSpec” is not recognised. I guess it’s because I’m using Julia version 0.7. not version 1.0.
---
### Author:  [@fredrikekre](https://discourse.julialang.org/u/fredrikekre)
#### Post date: [January 15, 2019, 7:28pm UTC](https://discourse.julialang.org/t/error-methoderror-no-method-matching-pin-string-versionnumber/19672/5 "2019-01-15T19:28:23Z")
Did you `using Pkg` first?
---
### Author:  [@bsnyh](https://discourse.julialang.org/u/bsnyh)
#### Post date: [January 15, 2019, 9:13pm UTC](https://discourse.julialang.org/t/error-methoderror-no-method-matching-pin-string-versionnumber/19672/6 "2019-01-15T21:13:16Z")
Here are updates: I tried
using Pkg
Pkg.add(PackageSpec(name = “GDAL”, version = “0.1.2”))
Pkg.pin(“GDAL”)
Pkg.installed(“GDAL”)
in the end, Pkg.installed(“GDAL”) still gives me v"0.2.0". It simply does not work in Julia 0.7. Or maybe I need to do this manually by my hand to delete the un-liked version and copy and paste the liked version. 😉
---
### Author:  [@bsnyh](https://discourse.julialang.org/u/bsnyh)
#### Post date: [January 16, 2019, 8:57am UTC](https://discourse.julialang.org/t/error-methoderror-no-method-matching-pin-string-versionnumber/19672/8 "2019-01-16T08:57:58Z")
this is really strange. I will post this as a new question to get more attention.