Wordpress site fix and optimization

HELLO. The purpose of this email is to introduce ourselves and connect with people with skills in web development with WordPress for our platform called LifePoints. We are developing a web platform that helps users identify and value the most important moments and experiences in their lives, those objectives they want to have as a reference for their future actions and all these through reflection on themselves. These LifePoints can be shared with the community. The basic operation of the service platform, expressed in a few words is: Compilation of the user's own LifePoints. Users can explore other users' LifePoints that allow them to view their content. The optimal functionality of the platform is to work in three different versions (English, Deutch and Spanish). We have already advanced the development of the web, nevertheless, we are looking for to optimize and to improve some functionalities for its correct use. A short description of the current situation is described below: [login to view URL] is a multi-author platform where all the content is created, wrote and directly posted by each author of the post. Basic functionality expected: Users log in to their own accounts and write a post directly from their own account. If a user enters LifePoints in the Spanish version, the system shall post the LifePoints the user is writing, in the Spanish version of the site [login to view URL] If a user enters LifePoints in the English version, the system shall post the LifePoints the user is writing, in the English version of the site [login to view URL] If a user enters LifePoints in the German version, the system shall post the LifePoints the user is writing, in the German version of the site [login to view URL] Objective: To create 3 different versions of the site [login to view URL] (one for each language: Deutsch, Spanish, English), Current Problem Users are able to log in to the platform, but not able to access their own account profiles nor write or publish a post. Error message: Notice: Trying to get property 'ID' of non-object in /var/www/vhosts/[login to view URL] on line 204 After this, we can provide you with a detailed informative session that explains the main features. [Removed for encouraging offsite communication which is against our Terms and Conditions -Section 13:Communication With Other Users] Please provide cost estimate and delivery time expected. Thank you for your quick comments.