# ERROR: LoadError: MethodError: no method matching isless(::String, ::Int64)

**URL:** https://discourse.julialang.org/t/error-loaderror-methoderror-no-method-matching-isless-string-int64/45408
**Category:** Optimization (Mathematical)
**Created:** [August 23, 2020, 9:08am UTC](https://discourse.julialang.org/t/error-loaderror-methoderror-no-method-matching-isless-string-int64/45408 "2020-08-23T09:08:56Z")
**Posts on this page:** 4
**Page:** 1

<div class="post-metadata">

### Author: ![mamo](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mamo/32/25591_2.png) [@mamo](https://discourse.julialang.org/u/mamo)
#### Post date: [August 23, 2020, 9:08am UTC](https://discourse.julialang.org/t/error-loaderror-methoderror-no-method-matching-isless-string-int64/45408/1 "2020-08-23T09:08:56Z")

</div>

Send me please your opinion related to the error I received.  
Thanks!

````julia
ERROR: LoadError: MethodError: no method matching isless(::String, ::Int64)
Closest candidates are:
  isless(::Missing, ::Any) at missing.jl:87
  isless(::AbstractFloat, ::Real) at operators.jl:158
  isless(::ForwardDiff.Dual{Tx,V,N} where N where V, ::Integer) where Tx at C:\Users\mmill\.julia\packages\ForwardDiff\sdToQ\src\dual.jl:139
  ...
Stacktrace:
 [1] <(::String, ::Int64) at .\operators.jl:268
 [2] <=(::String, ::Int64) at .\operators.jl:317
 [3] macro expansion at C:\Users\mmill\.julia\packages\MutableArithmetics\NuiNA\src\rewrite.jl:227 [inlined]
 [4] top-level scope at C:\Users\mmill\.julia\packages\JuMP\YXK4e\src\macros.jl:800
in expression starting at C:\Users\mmill\AppData\Local\JuliaPro-1.0.5-2\problem3.jl:230```
````

---

<div class="post-metadata">

### Author: ![Tamas\_Papp](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tamas_papp/32/25949_2.png) [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)
#### Post date: [August 23, 2020, 10:37am UTC](https://discourse.julialang.org/t/error-loaderror-methoderror-no-method-matching-isless-string-int64/45408/2 "2020-08-23T10:37:16Z")

</div>

You tried to compare a string to an integer and found that there is no such ordering defined.

In my opinion, it is a rather fine error.

---

<div class="post-metadata">

### Author: ![mamo](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/mamo/32/25591_2.png) [@mamo](https://discourse.julialang.org/u/mamo)
#### Post date: [August 23, 2020, 3:04pm UTC](https://discourse.julialang.org/t/error-loaderror-methoderror-no-method-matching-isless-string-int64/45408/3 "2020-08-23T15:04:38Z")

</div>

Thank you Tamas!

---

<div class="post-metadata">

### Author: ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)
#### Post date: [August 23, 2020, 10:24pm UTC](https://discourse.julialang.org/t/error-loaderror-methoderror-no-method-matching-isless-string-int64/45408/4 "2020-08-23T22:24:26Z")

</div>

Since your last two questions have been about `MethodError`s, here is the documentation: [Methods · The Julia Language](https://docs.julialang.org/en/v1/manual/methods/#Defining-Methods-1)