If you have purchased a Quantum Trading indicator and you are getting this error, it means that you may have incorrectly entered your email in your Data Folder’s MQL4 > Files > quantum_enabler_email.txt.
Open the text file above and type the email address you used to register then Save. Please make sure that this file contains ONLY your email and nothing else. Also, please make sure that you have entered this correctly and precisely. Your email address is used as part of the validation process, so it must be correct and match the one used EXACTLY.