设置SparkContext时出现Py4JError

Question

当我尝试使用SparkConf设置SparkContext时，我遇到了Py4JError。 我的代码如下：

// Transaction neads to write all docs read be transaction.get().
// To work around this we we call an update with {} for each document requested by transaction.get() before writing any data
export function runTransaction(updateFunction) {
  return db.runTransaction(transaction => {
    const docRefsRequested = [];
    let didSetRequestedDocs = false;

    function setEachRequestedDoc() {
      if (didSetRequestedDocs) {
        return;
      }
      didSetRequestedDocs = true;
      docRefsRequested.forEach(({ exists, ref }) => {
        if (exists) {
          transaction.update(ref, {});
        } else {
          transaction.delete(ref);
        }
      });
    }

    const transactionWrapper = {
      get: function(documentRef) {
        return transaction.get(ref).then(snapshot => {
          const { exists } = snapshot;
          docRefsRequested.push({ ref, exists });
          return Promise.resolve(snapshot);
        });
      },
      set: function(documentRef, data) {
        setEachRequestedDoc();
        return transaction.set(documentRef, data);
      },
      update: function(documentRef, data) {
        setEachRequestedDoc();
        return transaction.update(documentRef, data);
      },
      delete: function(documentRef) {
        setEachRequestedDoc();
        return transaction.delete(documentRef);
      },
    };

    return updateFunction(transactionWrapper).then(resolveValue => {
      setEachRequestedDoc();
      return Promise.resolve(resolveValue);
    });
  });
}

错误是这样的：

from pyspark import SparkContext, SparkConf
conf = SparkConf().setMaster("local").setAppName("Reference")
sc = SparkContext(conf = conf)

请提供任何帮助或建议。