Yes I found it because of limitation of Microsoft temporary upload for preview

When i render docx report about 10 pages it is OK. but when it reaches about 30 pages I got the error.

Error in console

My Config File

{
  "httpPort": 5488,
  "store": {
    "provider": "fs"
  },
  "blobStorage": {
    "provider": "fs"
  },
  "logger": {
    "console": {
      "transport": "console",
      "level": "debug"
    },
    "file": {
      "transport": "file",
      "level": "info",
      "filename": "logs/reporter.log"
    },
    "error": {
      "transport": "file",
      "level": "error",
      "filename": "logs/error.log"
    }
  },
  "allowLocalFilesAccess": true,
  "reportTimeout": 6000000,
  "templatingEngines": {
    "timeout": 6000000,
    "strategy": "dedicated-process",
    "forkOptions": {
      "execArgv": ["--max-old-space-size=6096"]
    }
  },
  "extensions": {
    "express": {
            "renderTimeout": 60000000,
            "inputRequestLimit": "2000mb"
        },
    "sample-template": {
      "createSamples": false
    },
    "scripts": {
      "strategy": "http-server"
    }
  }
}

Is my configuration wrong? or How can I solve this?

Thanks it work! because missing jsreport/jsreport-pdf-utils like you mention and my data is big so I need to use res.toObjectURL()

https://playground.jsreport.net/w/anon/h35IQ5cD
Work perfect with playground but error when using to render from browser !

I use jsreport-browser-client-dist to render pdf from template server + merge watermark. If without merge watermark it works perfect.

Code

Log on server

Watermark config