Facing Issue in 7th module of rapid developer course of mendix learning path

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                                                                                                                                                         we are facing issue in 7th module of rapid developer ,while registering the training event.we are getting a popup message that An error occured.please contact system administrator.(screenshot attached below)                                                                                                                                                                             when we go to console  of mendix we are getting the below error  (screen shot attached below).   
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