hello ; I am learning to use to HOpenGL to complete an asignement for next week and I have some trouble ; I have found a tutorial on the internet ; in that tutorial it was an example of the Rubik's Cube ; anyway ; in that example it was used a function called matrixExcursion ; and when I try to run the example it sais that :

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I don't know what to do ; please help ; I need to know immediatly how to fix this problem ; thanks for your time in reading this , and hope to hear from you soon ; I wish you all the best