Namespace error while installing 5.7.4

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During installation, I am getting this error.
Search it in forum, but it looks like no one had this issue.
I have attached screen shot.
{"error":{"message":"Namespace declaration statement has to be the very first statement in the script"},"errors":["Namespace declaration statement has to be the very first statement in the script"]}

1 Attachment

srjahir32
 

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