dl4j-0.0.3.3-examples compiling errors

[luolianhai]

i have compiled project nd4j, Canova and deeplearning4j successfully but errors occur while compiling dl4j-0.0.3.3-examples, the following are the errors:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project deeplearning4j-examples: Compilation failure: Compilation failure:
[ERROR] /home/luolianhai/dl4j-0.0.3.3-examples/src/main/java/org/deeplearning4j/deepbelief/DBNIrisExample.java:[22,49] cannot find symbol
[ERROR] symbol: class GradientPlotterIterationListener
[ERROR] location: package org.deeplearning4j.plot.iterationlistener
[ERROR] /home/luolianhai/dl4j-0.0.3.3-examples/src/main/java/org/deeplearning4j/deepbelief/DBNIrisExample.java:[23,49] cannot find symbol
[ERROR] symbol: class LossPlotterIterationListener
[ERROR] location: package org.deeplearning4j.plot.iterationlistener