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"Invocation of init method failed" typically means that an error occurred during the initialization of a component, module, or application.

"java.lang.IllegalArgumentException: The Secret cannot be null" specifically indicates that a parameter named "Secret" was expected to have a value, but was given a null value instead. This could be caused by a programming error, a configuration error, an input error, or a combination of these factors. The specific cause would need to be determined by examining the code or system configuration that is generating the error.