Problem: The client was unable to access the auto translation tools due to an error on "/wp-json/wpml/tm/v1". The issue persisted even with only WPML active and default themes. The client identified the issue within an output buffer and invalid HTML markup and fixed it.
Solution: We recommended the following steps to troubleshoot the issue: 1. Verify that the server meets the WPML minimum requirements. 2. Create a full website backup. 3. Disable all plugins except for WPML and its add-ons. 4. Check if the issue still occurs. 5. If the issue is resolved, reactivate plugins one by one to identify the conflicting plugin. 6. If the issue persists with non-WPML plugins disabled, switch to a default theme like TwentySeventeen and test again. We also suggested performing these steps in a staging environment if possible.
If these steps do not resolve the issue or if the solution provided here is outdated or not applicable to your case, we highly recommend checking the related known issues, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem continues, please open a new support ticket with us.
