Error while Compiling

[121eddie]

Ubuntu 18.04 Java 11.0.3
running (as part of fetch_and_preprocess.sh)
javac -cp $CLASSPATH lib/*.java -Xlint:unchecked

lib/CollapseUnaryTransformer.java:17: error: error while writing CollapseUnaryTransform
er: /home/eduard_ergenzinger/treelstm.pytorch/lib/CollapseUnaryTransformer.class
public class CollapseUnaryTransformer implements TreeTransformer {
       ^
lib/ConstituencyParse.java:58: warning: [unchecked] unchecked call to PTBTokenizer(Read
er,LexedTokenFactory<T>,String) as a member of the raw type PTBTokenizer
      PTBTokenizer<Word> tokenizer = new PTBTokenizer(new StringReader(line), new WordT
okenFactory(), "");
                                     ^
  where T is a type-variable:
    T extends HasWord declared in class PTBTokenizer
lib/ConstituencyParse.java:58: warning: [unchecked] unchecked conversion
      PTBTokenizer<Word> tokenizer = new PTBTokenizer(new StringReader(line), new WordT
okenFactory(), "");
                                     ^
  required: PTBTokenizer<Word>
  found:    PTBTokenizer
lib/DependencyParse.java:57: warning: [unchecked] unchecked call to PTBTokenizer(Reader
,LexedTokenFactory<T>,String) as a member of the raw type PTBTokenizer
        PTBTokenizer<Word> tokenizer = new PTBTokenizer(
                                       ^
  where T is a type-variable:
    T extends HasWord declared in class PTBTokenizer
lib/DependencyParse.java:57: warning: [unchecked] unchecked conversion
        PTBTokenizer<Word> tokenizer = new PTBTokenizer(
                                       ^
  required: PTBTokenizer<Word>
  found:    PTBTokenizer
1 error
4 warnings

[cikers]

had you fixed this problem?
I met the same error.

[Galaxfyos]

I met the same error, why?

[Galaxfyos]

had you fixed this problem? I met the same error.

have you solved this problem?