failed to run `@example` block in src/users_guide/QuantumObject/QuantumObject.md:41-45 ```@example Qobj Qobj(M, dims = [2, 2]) # dims as Vector Qobj(M, dims = (2, 2)) # dims as Tuple (recommended) Qobj(M, dims = SVector(2, 2)) # dims as StaticArrays.SVector (recommended) ``` exception = UndefVarError: `M` not defined Stacktrace: [1] top-level scope @ QuantumObject.md:42 [2] eval @ ./boot.jl:385 [inlined] [3] #60 @ ~/.julia/packages/Documenter/C1XEF/src/expander_pipeline.jl:754 [inlined] [4] cd(f::Documenter.var"#60#62"{Module, Expr}, dir::String) @ Base.Filesystem ./file.jl:112 [5] (::Documenter.var"#59#61"{Documenter.Page, Module, Expr})() @ Documenter ~/.julia/packages/Documenter/C1XEF/src/expander_pipeline.jl:753 [6] (::IOCapture.var"#5#9"{DataType, Documenter.var"#59#61"{Documenter.Page, Module, Expr}, IOContext{Base.PipeEndpoint}, IOContext{Base.PipeEndpoint}, IOContext{Base.PipeEndpoint}, IOContext{Base.PipeEndpoint}})() @ IOCapture ~/.julia/packages/IOCapture/Y5rEA/src/IOCapture.jl:170 [7] with_logstate(f::Function, logstate::Any) @ Base.CoreLogging ./logging.jl:515 [8] with_logger @ ./logging.jl:627 [inlined] [9] capture(f::Documenter.var"#59#61"{Documenter.Page, Module, Expr}; rethrow::Type, color::Bool, passthrough::Bool, capture_buffer::IOBuffer, io_context::Vector{Any}) @ IOCapture ~/.julia/packages/IOCapture/Y5rEA/src/IOCapture.jl:167 [10] runner(::Type{Documenter.Expanders.ExampleBlocks}, node::MarkdownAST.Node{Nothing}, page::Documenter.Page, doc::Documenter.Document) @ Documenter ~/.julia/packages/Documenter/C1XEF/src/expander_pipeline.jl:752