still trying to fix the problem

MeshViewerQt/Resources/TextureShader.frag

@@ -1,4 +1,4 @@
-#version 450
+#version 330
 
 // Input
 in vec2 UV;
@@ -8,5 +8,5 @@ out vec4 color;
 
 void main()
 {
-	color = texture(textureSampler, UV).rgb;
+	color = {255,0,0};//texture(textureSampler, UV).rgb;
 }

MeshViewerQt/Resources/TextureShader.vert

@@ -1,4 +1,4 @@
-#version 450
+#version 330
 
 // Input vertex data, different for all executions of this shader
 layout(location = 0) in vec3 vertexPosition;