ERROR IN NEW POST PREVIEW/PUBLISHING

Hi, I have problems with new articles of my blog.
Either on the page preview or publishing the article, under the title of the post, this is what I see instead of the content:

CATCHABLE FATAL ERROR: OBJECT OF CLASS WP_ERROR COULD NOT BE CONVERTED TO STRING IN /WEB/HTDOCS/WWW.WEBLY.INFO/HOME/WP-CONTENT/THEMES/BOLDIAL/ASSETS/FRAMEWORK/WP/OPTIONS/CUSTOM-FUNCTIONS.PHP ON LINE 640

Today I translated my theme into Italian, editing the en_US.po and uploading an it_IT.po and it_IT.mo via FTP. After the uploading, everything seemed to work, but when I tried to preview a new post I had just written, that error came out. So I deleted those two new files from the directory language and left the website terms in english again. Nevertheless the blog doesn’t work anymore.

Any suggestions?
Many thanks

• This topic was modified 8 years by  Lillys.