Error installing XLSX package

I’m trying to install the XLSX package into Julia to be able to import data from a spreadsheet. However, when I use the command Pkg.add("XLSX") I get the following error:

ERROR: Unsatisfiable requirements detectedfor package ASTInterpreter2 [e6d88f4b]:
ASTInterpreter2 [e6d88f4b] log:
├─possible versions are: 0.1.0-0.1.1 or uninstalled
├─restricted by julia compatibility requirements to versions: uninstalled
└─restricted by compatibility requirements with Atom [c52e3926] to versions: 0.1.0-0.1.1 — no versions left
└─Atom [c52e3926] log:
├─possible versions are: [0.1.0-0.1.1, 0.2.0-0.2.1, 0.3.0, 0.4.0-0.4.6, 0.5.0-0.5.10, 0.6.0-0.6.17, 0.7.0-0.7.15, 0.8.0-0.8.5] or uninstalled
└─restricted to versions 0.7.10 by anexplicit requirement, leaving only versions 0.7.10
Stacktrace:
[1] #propagate_constraints!#61(::Bool, ::Function, ::Pkg.GraphType.Graph, ::Set{Int64}) at /home/buildbot/build-worker/worker/juliapro-release-centos7-0_6/build/tmp_julia/share/julia/stdlib/v1.0/Pkg/src/GraphType.jl:1005
[2] propagate_constraints! at /home/buildbot/build-worker/worker/juliapro-release-centos7-0_6/build/tmp_julia/share/julia/stdlib/v1.0/Pkg/src/GraphType.jl:946 [inlined]
[3] #simplify_graph!#121(::Bool, ::Function, ::Pkg.GraphType.Graph, ::Set{Int64}) at/home/buildbot/build-worker/worker/juliapro-release-centos7-0_6/build/tmp_julia/share/julia/stdlib/v1.0/Pkg/src/GraphType.jl:1460
[4] simplify_graph! at /home/buildbot/build-worker/worker/juliapro-release-centos7-0_6/build/tmp_julia/share/julia/stdlib/v1.0/Pkg/src/GraphType.jl:1460 [inlined]
[5] resolve_versions!(::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}, ::Nothing) at /home/buildbot/build-worker/worker/juliapro-release-centos7-0_6/build/tmp_julia/share/julia/stdlib/v1.0/Pkg/src/Operations.jl:388
[6] resolve_versions! at /home/buildbot/build-worker/worker/juliapro-release-centos7-0_6/build/tmp_julia/share/julia/stdlib/v1.0/Pkg/src/Operations.jl:328 [inlined]
[7] #add_or_develop#63(::Array{Base.UUID,1}, ::Symbol, ::Function, ::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at /home/buildbot/build-worker/worker/juliapro-release-centos7-0_6/build/tmp_julia/share/julia/stdlib/v1.0/Pkg/src/Operations.jl:1232
[8] #add_or_develop at ./none:0 [inlined]
[9] #add_or_develop#15(::Symbol, ::Bool, ::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::Function, ::Pkg.Types.Context, ::Array{Pkg.Types.PackageSpec,1}) at /home/buildbot/build-worker/worker/juliapro-release-centos7-0_6/build/tmp_julia/share/julia/stdlib/v1.0/Pkg/src/API.jl:54
[10] #add_or_develop at ./none:0 [inlined]
[11] #add_or_develop#14 at /home/buildbot/build-worker/worker/juliapro-release-centos7-0_6/build/tmp_julia/share/julia/stdlib/v1.0/Pkg/src/API.jl:31 [inlined]
[12] #add_or_develop at ./none:0 [inlined]
[13] #add_or_develop#13 at /home/buildbot/build-worker/worker/juliapro-release-centos7-0_6/build/tmp_julia/share/julia/stdlib/v1.0/Pkg/src/API.jl:29 [inlined]
[14] #add_or_develop at ./none:0 [inlined]
[15] #add_or_develop#12 at /home/buildbot/build-worker/worker/juliapro-release-centos7-0_6/build/tmp_julia/share/julia/stdlib/v1.0/Pkg/src/API.jl:28 [inlined]
[16] #add_or_develop at ./none:0 [inlined]
[17] #add#20 at /home/buildbot/build-worker/worker/juliapro-release-centos7-0_6/build/tmp_julia/share/julia/stdlib/v1.0/Pkg/src/API.jl:59 [inlined]
[18] add(::String) at /home/buildbot/build-worker/worker/juliapro-release-centos7-0_6/build/tmp_julia/share/julia/stdlib/v1.0/Pkg/src/API.jl:59
[19] top-level scope at none:0

Any help would be really appreciated!

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