Error Message: The requested page can't be found

I am getting this error message when I click on any activity in my website - 'The requested page can't be found'
It should display the relevant SobiPro listing.
I have Joomla 1.1.3 and have installed the latest version of My SobiPro - version 1.1.3 and have copied the settings from the previous version.
I can't figure out why it is not displaying the SobiPro listings.
Any suggestions please?

Can you compare and share the URL you get for the error page and a valid sobipro entry page?
Make sure you disable Joomla SEF when you compare the URL so we can see the various parameters in the URL.

Thank you for your fast response. It looks like the problem is being caused in the configuration of the XSL and/or SOAP extension in php.ini on my localhost Xampp server where I am upgrading the website.
I raised a support ticket with Sigsiu and they have suggested a fix which I will try first. I'll post again here if that resolves it. Thanks

Update:-
The problem has been solved. I needed to install the latest version of SobiPro Core and then uncomment XSL and SOAP extensions in php.ini in Xampp/PHP/

Good news. Thank you for reporting and good luck with your project.