[tycho-user] Only one of the following can be installed at once

[e92-330cd@xxxxxxxxx]

Hello I have this error:

[ERROR]   Only one of the following can be installed at once: [com.ibm.icu 4.4.2.v20110823, com.ibm.icu 4.2.1.v20100412, com.ibm.icu 4.0.1.v20100112]

[ERROR]   Cannot satisfy dependency: aaaa.eclipse.product 1.0.0.qualifier depends on: bbbb.eclipse.application.feature.feature.group [1.0.0,1.0.1)
[ERROR]   Cannot satisfy dependency: aaaa.eclipse.product 1.0.0.qualifier depends on: cccc.target.standard.feature.feature.group 0.0.0
[ERROR]   Cannot satisfy dependency: bbbb.eclipse.application.feature.feature.group 1.0.0.201209142109 depends on: dddd.eclipse.feature.feature.group [1.0.0.201209142109]
[ERROR]   Cannot satisfy dependency: dddd.eclipse.feature.feature.group 1.0.0.201209142109 depends on: org.eclipse.rcp.feature.group [3.6.2.r362_v20101104-9SAxFMKFkSAqi8axkv1ZjegmiBLY]
[ERROR]   Cannot satisfy dependency: eeee.target.standard.feature.feature.group 2012.4.2 depends on: com.ibm.icu [4.4.2.v20110823]
[ERROR]   Cannot satisfy dependency: org.eclipse.rcp.feature.group 3.6.2.r362_v20101104-9SAxFMKFkSAqi8axkv1ZjegmiBLY depends on: com.ibm.icu [4.2.1.v20100412]

in parrent pom I have defined this:

<repositories>
		<repository>
			<id>helios</id>
			<layout>p2</layout>
			<url>http://download.eclipse.org/releases/helios</url>
		</repository>
.
.
.

<!-- Tycho platform -->
			<plugin>
				<groupId>org.eclipse.tycho</groupId>
				<artifactId>target-platform-configuration</artifactId>
				<version>${tycho-version}</version>
				<configuration>
					<environments>
						<environment>
							<os>win32</os>
							<ws>win32</ws>
							<arch>x86</arch>
						</environment>
					</environments>
				</configuration>
			</plugin>

so can somebody tell me how to fix this? 
Thanks