我無法使用 pdf2json 將 pdf 轉(zhuǎn)換為 json 格式。我想通過nodejs使用pdf2json庫將pdf文件轉(zhuǎn)換為json格式。但是，我為json指定的目錄中沒有json文件，我放一個(gè)空的json文件時(shí)它并沒有過期。當(dāng)我在調(diào)試模式下運(yùn)行我的代碼時(shí)，它會輸出以下日志。我該怎么做才能保存為json？我遵循這些步驟； https://github.com/modesty/pdf2json控制臺日志消息/Desktop/nodejs-pdf-parse/app.jsDebugger listening on ws://127.0.0.1:45843/bb0e57e8-b28d-4652-81f8-2cba00f4372bFor help, see: https://nodejs.org/en/docs/inspectorDebugger attached.Waiting for the debugger to disconnect...Process finished with exit code 130 (interrupted by signal 2: SIGINT)節(jié)點(diǎn)let fs = require('fs'), PDFParser = require("pdf2json");let pdfParser = new PDFParser(this, 1);try {    pdfParser.loadPDF("/Desktop/nodejs-pdf-parse/pdf/Paycheck-Protection.pdf");}catch (e) {    console.log(e)}pdfParser.on("pdfParser_dataError", errData => console.error(errData.parserError) );pdfParser.on("pdfParser_dataReady", pdfData => {    fs.writeFile("/Desktop/nodejs-pdf-parse/parsed-json/parsed.json", JSON.stringify(pdfData));});運(yùn)行：節(jié)點(diǎn) app.jsfs.js:148  throw new ERR_INVALID_CALLBACK(cb);  ^TypeError [ERR_INVALID_CALLBACK]: Callback must be a function. Received undefined    at maybeCallback (fs.js:148:9)    at Object.writeFile (fs.js:1298:14)    at PdfParser.<anonymous> (/home/mutlueren/Desktop/nodejs-pdf-parse/app.js:7:8)    at PdfParser.emit (events.js:315:20)    at PdfParser._onPDFJSParseDataReady (/home/mutlueren/Desktop/nodejs-pdf-parse/node_modules/pdf2json/pdfparser.js:25:9)    at cls.emit (events.js:315:20)    at /home/mutlueren/Desktop/nodejs-pdf-parse/node_modules/pdf2json/lib/pdf.js:250:38    at processTicksAndRejections (internal/process/task_queues.js:79:11) {  code: 'ERR_INVALID_CALLBACK'}