Hello, I reinstalled Julia (v1.4.1), and now I am no longer able to use JuMP. Please find my code and error log below.

`Pkg.add("JuMP")`

should install the recent version of JuMP but when I check the status it is actually JuMP v0.18.6. I have tried `Pkg.update("JuMP")`

and `Pkg.build("JuMP")`

but still the version remains the same.

CLP solver version is Clp v0.8.0

I am not sure what is causing this error as yesterday everything was working fine post reinstallation, so something must have gone wrong after restarting the computer. Any help will be appreciated.

```
using JuMP
using Clp
model = Model(Clp.Optimizer)
```

```
ERROR: MethodError: no method matching Model(::Type{Clp.Optimizer})
Closest candidates are:
Model(::Any, ::Symbol, ::Any, ::Any, ::Any, ::Any, ::Any, ::Int64, ::Array{String,1}, ::Array{String,1}, ::Array{Float64,1}, ::Array{Float64,1}, ::Array{Symbol,1}, ::Array{T,1} where T, ::Array{Tuple{Symbol,Any},1}, ::Any, ::Any, ::Array{Float64,1}, ::Array{Float64,1}, ::Array{Float64,1}, ::Array{Float64,1}, ::Array{Array{Int64,1},1}, ::Array{Array{Tuple{Int64,Int64},1},1}, ::Any, ::MathProgBase.SolverInterface.AbstractMathProgSolver, ::Bool, ::Any, ::Any, ::Any, ::Array{T,1} where T, ::JuMP.IndexedVector{Float64}, ::Any, ::Bool, ::Dict{Symbol,Any}, ::IdDict, ::Int64, ::Int64, ::Dict{Symbol,Any}) at C:\Users\.julia\packages\JuMP\I7whV\src\JuMP.jl:87
Model(::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any, ::Any) at C:\Users\.julia\packages\JuMP\I7whV\src\JuMP.jl:87
Model(; solver, simplify_nonlinear_expressions) at C:\Users\.julia\packages\JuMP\I7whV\src\JuMP.jl:168
Stacktrace:
[1] top-level scope at REPL[14]:1
```