When i try to use m_context->compile() i get the error RT_ERROR_INVALID_CONTEXT.
I call this function in my function to initialize the scene. My code before calling compile looks like this

// Create OptiX context
// Create Output buffer
// Camera ray gen and exception program  
// more programs
// create various buffer
//getting ready to run
g_OptixContext->validate();// no error here

So my general question is, why this error can occur.

Thanks for your help

ok i figured out the problem myself:)