The error also exists on the computer, but I can't say exactly what it is.

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Oh.

When you don't know what is the error then there is no any possibility that WX5 team will look into the matter and resolve it 

Now please suggest me what to do? 

There are 2 index files on the web space, where index.php (see screenshot) contains the error and must be deleted.

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Errors often occur when an intro page is used and the intro page is then deactivated.

Einführungsseite

...as Daniel has already reported...
...the real site runs here:
> https://www.riddhicasting.com/index.html
...on the internet you have to manually delete the index.php  file...!...

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ciao

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Thank you for your support.