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  1. ,
    via stackoverflow.com by Unknown author

    When you iterate over the lines of a scala.io.Source with source.getLines, make sure you do not close the source until you processed the iterator.

  2. ,
    via Super User by leeand00

    This occurs when the file is being locked by another application. Check if another process is accessing the same file. On Windows follow this post to figure it out : https://goo.gl/yPp1To

    If it's being used, terminate that process to gain access.

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java.io.IOException: invalid identifier at java.io.FileInputStream.readBytes(Native Method) at java.io.FileInputStream.read(FileInputStream.java:191) at java.io.BufferedInputStream.read1(BufferedInputStream.java:220) at java.io.BufferedInputStream.read(BufferedInputStream.java:277) at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:406) at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:446) at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:180) at java.io.InputStreamReader.read(InputStreamReader.java:167) at java.io.BufferedReader.fill(BufferedReader.java:136) at java.io.BufferedReader.readLine(BufferedReader.java:299) at java.io.BufferedReader.readLine(BufferedReader.java:362) at aritmetica.Stub.getOperationRequested(Stub.java:100) at aritmetica.Stub.go(Stub.java:66) at aritmetica.Stub.main(Stub.java:33)