Warning: round() expects parameter 2 to be long

To day I got my opencart powered online store got problem like:
And all price in my web is missing. and only show currency symbol only. I has view file than mentioned by error messages, but I compuse what must to do with that code due I not have basic programing in PHP.

Could you all help me to fix this problem, or any clue that I have to read to do fix this problem?

for more info what problem I face I attach my web screenshot here:
Thank you