Can anybody help me with this error please...

Error: A charset attribute on a meta element found after the first 1024 bytes

https://validator.w3.org/nu/?doc=https%3A%2F%2Fsocialmotors.uk%2F

I have no idea how to find or fix this issue, i have spoke to my theme dev and they say it is not a problem with the theme, so i do not know were to turn now.

As you will see in the link above there are a couple of errors, i do not know how to fix them either

Any help would be greatly appreciated.

Thanks