Data must be valid JSON

I have build a workflow for testing IFC data that convert into pdf files but when i want to convert the html file into a pdf gives a error

Describe the problem/error/question

I have build a workflow for testing IFC data that convert into pdf files but when i want to convert the html file into a pdf gives a errors the error message ‘data must be valid JSON’ know someone how i solve this problem?

Please share your workflow

(Select the nodes on your canvas and use the keyboard shortcuts CMD+C/CTRL+C and CMD+V/CTRL+V to copy and paste the workflow.)

Share the output returned by the last node

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