[Soot-list] Error named "no visible type named"

[zhang]

Hi,
I get an error when I'm using Soot with Ant 1.6. Here are some detail messages :
Soot started on Wed Apr 13 10:19:21 CST 2011
G:\Slice\program\apache-ant-1.6.0\apache-ant-1.6.0\src\main\org\apache\tools\ant\taskdefs\optional\ide\VAJAntTool.java:58,8:
  Semantic Error: no visible type named com.ibm.ivj.util.base.Project
G:\Slice\program\apache-ant-1.6.0\apache-ant-1.6.0\src\main\org\apache\tools\ant\taskdefs\optional\ide\VAJAntTool.java:59,8:
  Semantic Error: no visible type named com.ibm.ivj.util.base.ToolData
G:\Slice\program\apache-ant-1.6.0\apache-ant-1.6.0\src\main\org\apache\tools\ant\taskdefs\optional\ide\VAJAntTool.java:88,13:
  Semantic Error: no visible type named Project
G:\Slice\program\apache-ant-1.6.0\apache-ant-1.6.0\src\main\org\apache\tools\ant\taskdefs\optional\ide\VAJAntTool.java:91,17:
  Semantic Error: no visible type named ToolData
G:\Slice\program\apache-ant-1.6.0\apache-ant-1.6.0\src\main\org\apache\tools\ant\taskdefs\optional\ide\VAJAntTool.java:141,13:
  Semantic Error: no visible type named ToolData
G:\Slice\program\apache-ant-1.6.0\apache-ant-1.6.0\src\main\org\apache\tools\ant\taskdefs\optional\ide\VAJAntTool.java:141:
  Semantic Error: can not instantiate Unknown no matching constructor found in Unknown
G:\Slice\program\apache-ant-1.6.0\apache-ant-1.6.0\src\main\org\apache\tools\ant\taskdefs\optional\ide\VAJAntTool.java:141,31:
  Semantic Error: no visible type named ToolData

Do I have to find the class named "com.ibm.ivj.util.base.Project" and added it to Soot's classpath. Because I am not care for what does the package do, I think the "-allow-phantom-refs" option can do something for this situation. However it does not work. Is there a way to make Soot work with it?
Thank you.

zhang