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I found the Internal Server Error. And found that this problem came from the Paid Memberships Pro plugin.
https://nimb.ws/IasxMf
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Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
The most common causes of this problem are errors in the app's .htaccess file or incorrect file or directory permissions preventing the web server from reading the .htaccess file.
Detailed information about this error is available in the app's Apache error log at:
/srv/users/SYSUSER/log/<wbr />APPNAME/APPNAME_apache.error.<wbr />log
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After I inform the service provider Serverpirot.io By informing me that ....
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<span style="color: #222222; font-family: sans-serif; font-size: small;">As the error indicates, the information in the app's Apache logfile is helpful here:</span><br style="color: #222222; font-family: sans-serif; font-size: small;" /><br style="color: #222222; font-family: sans-serif; font-size: small;" /><span style="color: #222222; font-family: sans-serif; font-size: small;">[Mon Aug 12 12:44:13.578742 2019] [core:error] [pid 24859:tid 139893460104960] [client </span>
46.229.168.135:0<span style="color: #222222; font-family: sans-serif; font-size: small;">] AH00124: Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace.
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