Problem with ShaderProgram

[Malhcifer]

I am following an opengl tutorial that uses qt. I have made a GLWidget class that derives from QGLWidget. My class has a QGLShaderProgram member to compile and link the shader programs. The tutorial has a very simple vertext shader

@
uniform mat4 mvpMatrix;

in vec4 vertex;

void main()
{
gl_Position = mvpMatrix * vertex;
}
@

and a fragment shader

@
uniform vec4 color;

out vec4 fragColor;

void main(void)
{
fragColor = color;
}
@

When I use the QGLShaderProgram to add and link them I get the following errors
@
QGLShader::compile(Vertex): 0:6(15): error: in' qualifier in declaration ofvertex' only valid for function parameters in GLSL 1.10.
QGLShader::compile(Fragment): 0:6(19): error: out' qualifier in declaration offragColor' only valid for function parameters in GLSL 1.10.
@

I ran

@
qDebug() << "OpenGL Versions Supported: " << QGLFormat::openGLVersionFlags();
qDebug() << QLatin1String(reinterpret_cast<const char*>(glGetString(GL_VERSION)));
@

and got the output
@
OpenGL Versions Supported: QFlags(0x1|0x2|0x4|0x8|0x10|0x20|0x40|0x1000)
"3.0 Mesa 9.1.4"
@

Shouldn't it be using glsl 1.3?
I am not sure why I am getting this error.

here is the code I use to add them

@
void GLWidget::initializeGL()
{
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);

qglClearColor(QColor(Qt::black));

shaderProgram.addShaderFromSourceFile(QGLShader::Vertex, "../test/shaders/vertexShader.vsh");
shaderProgram.addShaderFromSourceFile(QGLShader::Fragment, "../test/shaders/fragmentShader.fsh");
shaderProgram.link();

qDebug() << "OpenGL Versions Supported: " << QGLFormat::openGLVersionFlags();
qDebug() << QLatin1String(reinterpret_cast<const char*>(glGetString(GL_VERSION)));

verticies << QVector3D(1,0,-2) << QVector3D(0,1,-2) << QVector3D(-1,0,-2);

}
@

[john_god]

Try running the program without in and out qualifiers in the shaders

[Malhcifer]

I did some more research and changed the shaders

Fragment Shader
@
uniform vec4 color;

void main(void)
{
gl_FragColor = color;
}
@

Vertex Shader
@
uniform mat4 mvpMatrix;

attribute vec4 vertex;

void main()
{
gl_Position = mvpMatrix * vertex;
}
@

It works now.