From e1570a285c9939bc923246d78f20cd1548660f1c Mon Sep 17 00:00:00 2001
From: Guillaume Marques <guillaume.marques@protonmail.com>
Date: Fri, 18 Dec 2020 21:27:12 +0100
Subject: [PATCH] Error when no solver provided (#423)

* Rm unused Params

* error when no solver provided
---
 src/optimize.jl | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/optimize.jl b/src/optimize.jl
index 1a466d736..55d07ddff 100644
--- a/src/optimize.jl
+++ b/src/optimize.jl
@@ -73,9 +73,6 @@ function optimize!(prob::MathProg.Problem, annotations::Annotations, params::Par
     return optstate
 end
 
-"""
-Solve a reformulation
-"""
 function optimize!(
     reform::MathProg.Reformulation, algorithm::Algorithm.AbstractOptimizationAlgorithm,
     initial_primal_bound, initial_dual_bound
@@ -123,3 +120,16 @@ function optimize!(
 
     return outstate
 end
+
+"""
+Fallback if no solver provided by the user.
+"""
+function optimize!(
+    ::MathProg.Reformulation, ::Nothing,
+    ::Real, ::Real
+)
+    error("""
+        No solver to optimize the reformulation. You should provide a solver through Coluna parameters. 
+        Please, check the starting guide of Coluna.
+    """)
+end
\ No newline at end of file