# Build error
**URL:** https://discourse.julialang.org/t/build-error/9375
**Category:** General Usage
**Created:** [February 27, 2018, 7:25pm UTC](https://discourse.julialang.org/t/build-error/9375 "2018-02-27T19:25:40Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@kern](https://discourse.julialang.org/u/kern)
#### Post date: [February 27, 2018, 7:25pm UTC](https://discourse.julialang.org/t/build-error/9375/1 "2018-02-27T19:25:40Z")
I am getting build errors for IJulia, PyCall, MbedTLS, Homebrew and ZMQ with Pkg.update().
The error in each case is:
LoadError: MethodError: convert(::Type{Union{Array{String,N} where N, Void}}, ::Void) is ambiguous. Candidates:
convert(::Type{Union{T, Void}}, x) where T in Compat at string:8
convert(::Type{T}, x::T) where T in Base at essentials.jl:29
I would welcome any suggested fixes. Thanks.
Julia Version 0.6.0-pre.alpha.47
Commit 145eae8 (2017-03-04 10:09 UTC)
Platform Info:
OS: macOS (x86\_64-apple-darwin13.4.0)
CPU: Intel(R) Core™ i5-5287U CPU @ 2.90GHz
WORD\_SIZE: 64
BLAS: libopenblas (USE64BITINT DYNAMIC\_ARCH NO\_AFFINITY Haswell)
LAPACK: libopenblas64\_
LIBM: libopenlibm
LLVM: libLLVM-3.9.1 (ORCJIT, broadwell)
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### Author:  [@rdeits](https://discourse.julialang.org/u/rdeits)
#### Post date: [February 27, 2018, 7:42pm UTC](https://discourse.julialang.org/t/build-error/9375/2 "2018-02-27T19:42:01Z")
Have you tried updating to the latest v0.6.2 release from [Download Julia](https://julialang.org/downloads/) ? It’s just a bugfix release, so your other code should continue to work.
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### Author:  [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)
#### Post date: [February 27, 2018, 7:48pm UTC](https://discourse.julialang.org/t/build-error/9375/3 "2018-02-27T19:48:25Z")
> [@kern](#):
>
> Julia Version 0.6.0-pre.alpha.47
You’re using an old unreleased version of Julia. This is very much not recommended, and I’m curious why you have it 😉
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### Author:  [@kern](https://discourse.julialang.org/u/kern)
#### Post date: [February 27, 2018, 8:11pm UTC](https://discourse.julialang.org/t/build-error/9375/4 "2018-02-27T20:11:08Z")
Sorry, I thought I had the latest update. I had no issues using v0.6.2. Thank you for your quick replies.