I need help from a web designer with coding issues

Hello
I need help with my Website. Where in the back end of the afternoon so are a number of coding issues which has appeared on my dashboard. I have spoken to my Hosting company and they have advised The reported errors are related to a function in my core wordpress files that is no longer able to execute. Most likely the code needs to be reworked in order for the function to be working again. Web coding/developing is outside of their scope of support and have advised I need to check with a web developer who can investigate the code issues.