This is the technical support forum for WPML - the multilingual WordPress plugin.
Everyone can read, but only WPML clients can post here. WPML team is replying on the forum 6 days per week, 22 hours per day.
Our next available supporter will start replying to tickets in about 9.22 hours from now. Thank you for your understanding.
This thread is resolved. Here is a description of the problem and solution.
Problem: Fatal error: Uncaught exception 'InvalidArgumentException' with message 'Argument ID must be numeric and greater than 0.'
Solution: Upgrading the plugin to Latest version 3.6.1 solved the issue.
Relevant Documentation: https://wpml.org/errata/fatal-error-uncaught-exception-invalidargumentexception/