No, im not sure why you deleted it, please backup files before deleting them.
Unfortunately without access to log files there is no way to simply tell you what the issue is, typically "Internal Server" errors are an htaccess issue or a server misconfiguration, please submit a ticket to your host and provide them with the necessary information to reproduce the error, they should be able to check the log file and tell you what is causing the issue and provide a solution.
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