diff --git a/src/Solver/ASolver.py b/src/Solver/ASolver.py
index bfb47aa7..b4285923 100644
--- a/src/Solver/ASolver.py
+++ b/src/Solver/ASolver.py
@@ -193,6 +193,11 @@ class AbstractSolver(object):
         exe = cmd[0]
         args = cmd[1:]
 
+        if not os.path.exists(exe):
+            error = f"[ERROR] Path {exe} do not exists"
+            logger.info(error)
+            return error
+
         self._process.start(
             exe, args,
         )
@@ -216,6 +221,11 @@ class AbstractSolver(object):
         exe = cmd[0]
         args = cmd[1:]
 
+        if not os.path.exists(exe):
+            error = f"[ERROR] Path {exe} do not exists"
+            logger.info(error)
+            return error
+
         self._process.start(
             exe, args,
         )
@@ -240,6 +250,11 @@ class AbstractSolver(object):
         exe = cmd[0]
         args = cmd[1:]
 
+        if not os.path.exists(exe):
+            error = f"[ERROR] Path {exe} do not exists"
+            logger.info(error)
+            return error
+
         self._process.start(
             exe, args,
         )
@@ -255,7 +270,9 @@ class AbstractSolver(object):
     def _run_next(self):
         self._step += 1
         if self._step < len(self._runs):
-            self._runs[self._step]()
+            res = self._runs[self._step]()
+            if res is not True:
+                self._output.put(res)
         else:
             self._status = STATUS.STOPED
 
@@ -281,7 +298,9 @@ class AbstractSolver(object):
         ]
         self._step = 0
         # Run first step
-        self._runs[0]()
+        res = self._runs[0]()
+        if res is not True:
+            self._output.put(res)
 
     def kill(self):
         if self._process is None:
diff --git a/src/View/RunSolver/Window.py b/src/View/RunSolver/Window.py
index dba5a16e..4f915950 100644
--- a/src/View/RunSolver/Window.py
+++ b/src/View/RunSolver/Window.py
@@ -198,7 +198,10 @@ class SolverLogWindow(ASubMainWindow, ListedSubWindow):
 
         while self._output.qsize() != 0:
             s = self._output.get()
-            self._log(s)
+            if type(s) is str and "[ERROR]" in s:
+                self._log(s, color="red")
+            else:
+                self._log(s)
 
     def start(self):
         if self._solver.is_stoped():