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Problem:
If you're experiencing issues with the Ninja Forms Multilingual plugin where the PDF Form Submission extension fails to export PDFs when a form includes a checkboxlist field, this might be due to a compatibility problem between these plugins.

Solution:
We have escalated this issue to our development team and have published a workaround on our errata page. We recommend you visit https://wpml.org/errata/ninja-forms-pdf-form-submissions-pdf-export-errors-with-checkboxes-field/ and apply the suggested steps.

Additionally, subscribing to the comments on this errata page will keep you updated on when a permanent fix is rolled out.

Please note that this solution might be irrelevant if it's outdated or not applicable to your specific case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the issue persists, please open a new support ticket at WPML support forum for further assistance.