bin/compile-examples.sh does not work

lewis@lewis-01:~/ASF/gora$ bin/compile-examples.sh
Compiling gora-core/src/examples/avro/employee.json
Compiling gora-core/src/examples/avro/tokendatum.json
Compiling gora-core/src/examples/avro/webpage.json
Exception in thread "main" org.apache.avro.SchemaParseException: Map has no
values type: {"type":"map","items":"string"}
   at org.apache.avro.Schema.parse(Schema.java:938)
   at org.apache.avro.Schema.parse(Schema.java:912)
   at org.apache.avro.Schema.parse(Schema.java:796)
   at
org.apache.gora.compiler.GoraCompiler.compileSchema(GoraCompiler.java:62)
   at org.apache.gora.compiler.GoraCompiler.main(GoraCompiler.java:448)
Compiling gora-core/src/examples/avro/webpage.json~
Exception in thread "main" org.apache.avro.SchemaParseException: Array has
no items type: {"type":"array","values":"string"}
   at org.apache.avro.Schema.parse(Schema.java:933)
   at org.apache.avro.Schema.parse(Schema.java:912)
   at org.apache.avro.Schema.parse(Schema.java:796)
   at
org.apache.gora.compiler.GoraCompiler.compileSchema(GoraCompiler.java:62)
   at org.apache.gora.compiler.GoraCompiler.main(GoraCompiler.java:448)