Hello,

I do not know if I am posting in the right place but anyway.

I am having issues with my WHMCS integration. I've put all files into /templates folder and when I switch to my new template, I got a blank page when I visit the site.

Hope you guys have a solution :)

Regards

Blank pages usually signify a syntax error. Missing ";" or things of that nature. Your error logs show anything?

The folder I uploaded is an exact copy of the 'portal' folder that works just fine

I didn't change any files yet.

Delete all the files in /templates_c

When I delete all files in templates_c, it makes whmcs crash at all

The folder I uploaded is an exact copy of the 'portal' folder that works just fine
If nothing was changed from one that worked, then perhaps your upload method is incorrect. BINARY vs ASCII upload method. Check what you used, and try the other. Also make sure all files made it to the server.
When I delete all files in templates_c, it makes whmcs crash at all
As that's only a temp folder to stored cached templates, it shouldn't "crash" WHMCS unless something more is wrong here. If it were working correctly, it would simply write new files to that folder.

nothing worked with BINARY or ASCII..

Are you saying that uploading with either method made things worse?
Please explain fully when replying for the benefit of those trying to help. ;)

I have tried to upload my new template in ASCII and BINARY. no one is working still blank.

Hey, try ordering the integration service from the website , its very affordable and they do a great job

looks like your best bet is to reinstall whmcs backup your database and do a fresh install then reconnect the database and see what happens. Your problem is probably permissions there is documentation on the whmcs site about how to fix your permissions but if thats to big of a deal just to a reinstall.