Promotion ambiguity error

[Tokazama]

ERROR: MethodError: promote_rule(::Type{StepRangeLen{Float64,Base.TwicePrecision{Float64},Base.TwicePrecision{Float64}}}, ::Type{UnitMRange{Int64}}) is ambiguous. Candidates:
  promote_rule(a::Type{StepRangeLen{T,R,S}}, ::Type{OR}) where {T, R, S, OR<:AbstractRange} in Base at range.jl:915
  promote_rule(a::Type{#s38} where #s38<:StepRangeLen, b::Type{#s37} where #s37<:UnitMRange) in StaticRanges at /Users/zchristensen/Box/Zachs_Lab_Notebook/StaticRanges.jl/src/promotion.jl:116
Possible fix, define
  promote_rule(::Type{StepRangeLen{T,R,S}}, ::Type{OR}) where {T, R, S, OR<:UnitMRange}