Extended function not being seen (Is explicity imported)

General Usage
3

Of course

ERROR: LoadError: MethodError: no method matching apply_back(::Tuple{ArrayReg{1,Complex{Float64},Array{Complex{Float64},2}},ArrayReg{1,Complex{Float64},Array{Complex{Float64},2}}}, ::ImagTimeEvolution{10,Int64,Add{10}}, ::Array{Any,1})
Closest candidates are:
  apply_back(::Tuple{var"#s317",var"#s316"} where var"#s316"<:ArrayReg where var"#s317"<:ArrayReg, ::AbstractBlock; kwargs...) at C:\Users\ap877\.julia\packages\YaoBlocks\a3uN9\src\autodiff\apply_back.jl:149
Stacktrace:
 [1] apply_back!(::Tuple{ArrayReg{1,Complex{Float64},Array{Complex{Float64},2}},ArrayReg{1,Complex{Float64},Array{Complex{Float64},2}}}, ::ImagTimeEvolution{10,Int64,Add{10}}, ::Array{Any,1}) at C:\Users\ap877\.julia\packages\YaoBlocks\a3uN9\src\autodiff\apply_back.jl:25
 [2] apply_back(::Tuple{ArrayReg{1,Complex{Float64},Array{Complex{Float64},2}},ArrayReg{1,Complex{Float64},Array{Complex{Float64},2}}}, ::ImagTimeEvolution{10,Int64,Add{10}}; 
kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at C:\Users\ap877\.julia\packages\YaoBlocks\a3uN9\src\autodiff\apply_back.jl:151
 [3] apply_back(::Tuple{ArrayReg{1,Complex{Float64},Array{Complex{Float64},2}},ArrayReg{1,Complex{Float64},Array{Complex{Float64},2}}}, ::ImagTimeEvolution{10,Int64,Add{10}}) 
at C:\Users\ap877\.julia\packages\YaoBlocks\a3uN9\src\autodiff\apply_back.jl:150
 [4] expect_g(::Add{10}, ::Pair{ArrayReg{1,Complex{Float64},Array{Complex{Float64},2}},ImagTimeEvolution{10,Int64,Add{10}}}) at C:\Users\ap877\.julia\packages\YaoBlocks\a3uN9\src\autodiff\specializes.jl:15
 [5] (::Adjoint{Any,typeof(expect)})(::Add{10}, ::Pair{ArrayReg{1,Complex{Float64},Array{Complex{Float64},2}},ImagTimeEvolution{10,Int64,Add{10}}}) at C:\Users\ap877\.julia\packages\YaoBlocks\a3uN9\src\autodiff\specializes.jl:8
 [6] top-level scope at C:\Users\ap877\OneDrive - University of Exeter\Julia\GSEProject\ImagTEBlock.jl:81
 [7] include_string(::Function, ::Module, ::String, ::String) at .\loading.jl:1088
in expression starting at C:\Users\ap877\OneDrive - University of Exeter\Julia\GSEProject\ImagTEBlock.jl:81