have you updated/deactivated/deleted any plugin or updated your wordpress version
than do check whether your wp-config file, as few days ago i face similar problem but now everything is fine
In that case I would like to recommend you,please provide us the exact URL where you are facing the problem, so we will investigate the issue or its always better to consult this issue with the hosting or server provider because some time server side changes also cause such issues ....
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