Why do I get py4j error in Pyspark when using the 'count' function

I'm trying to run a simple code in pyspark but I'm getting py4j error.

from pyspark import SparkContext

logFile = "file:///home/hadoop/spark-2.1.0-bin-hadoop2.7/README.md"  
sc = SparkContext("local", "word count")
logData = sc.textFile(logFile).cache()
numAs = logData.filter(lambda s: 'a' in s).count()
numBs = logData.filter(lambda s: 'b' in s).count()

the error is:

An error occurred while calling o75.printStackTrace. Trace:
py4j.Py4JException: Method printStackTrace([class org.apache.spark.api.java.JavaSparkContext]) does not exist
    at py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:318)
    at py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:326)
    at py4j.Gateway.invoke(Gateway.java:274)
    at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
    at py4j.commands.CallCommand.execute(CallCommand.java:79)
    at py4j.GatewayConnection.run(GatewayConnection.java:238)
    at java.base/java.lang.Thread.run(Thread.java:835)

I configured the environment variables but it still didn't work. I even tried findspark.init() but didn't work again. What am I doing wrong?

I am sure that the environment variables are not set correctly. Could you please post all the environment variables. Mine is as below and it's working correctly

Check SCALA_HOME and SPARK_HOME especially. There should not be "bin" after the end.

My windows environments:

1. HADOOP_HOME = C:\spark\hadoop
2. JAVA_HOME = C:\Program Files\Java\jdk1.8.0_151
3. SCALA_HOME = *C:\spark\scala*
4. SPARK_HOME = *C:\spark\spark* PYSPARK_PYTHON = C:\Users\user\Anaconda3\envs\python.exe
5. PYSPARK_DRIVER_PYTHON = C:\Users\user\Anaconda3\envs\Scripts\jupyter.exe
6. PYSPARK_DRIVER_PYTHON_OPTS = notebook