Resolving the error "You must specify a value for this required field" while trying to save and close a SharePoint webPart page

If you are working in a SharePoint project and at the time of working in a SharePoint page, starts getting an error stating "You must specify a value for this required field" at the time of saving the changes done to the page though you are sure you have all the webPart properties are set with right values, then check one more thing - are you using custom master page?

Many times when we design custom master page, we comment out the code block inside the master page which is responsible of showing the Navigation Breadcrumb inside the ribbon. That block is present under the div tag with id 's4-workspace' and with asp:ContentPlaceHolder id="PlaceHolderPageTitleInTitleArea".
So make sure this ContentPlaceHolder is not commented out. If you don't want it to appear in your master page, you can use the Style="display:none" function as shown below. Save it and go back to the page where you got the error and try to save it. You will see the page will be saved without throwing any error!