checkout source code from svn

Hi,
I'm newbie in Maven. I'd like to checkout svn source. When I tried bellow
command line

svn co svn://my_svn_Ip/Development/execute-workflow

my source code checked out successful.

But I fail when tried mvn scm:checkout. Bellow is my pom.xml file:
<project>
 ...
<build>
  <plugins>
     <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-scm-plugin</artifactId>
             <version>1.1</version>

             <configuration>         
                      <username>username</username>                          
                      <password>password</password>          
              </configuration>

     </plugin>
     </plugins>
<scm>
   
      
<connection>scm:svn:file:///my_svn_Ip/Development/execute-workflow</connection>
  
       <tag>HEAD</tag>
       
 </scm>
  
  </build>

</project>

It said that:
[ERROR] svn: Unable to open an ra_local session to URL
svn: Unable to open repository
'file:///my_svn_Ip/Development/execute-workflow'
svn: Can't open file '\my_svn_Ip/Development/execute-workflow\format': The
filename, directory name, or volume label syntax is incorrect

My svn url is pure ( don't use http or http url ). Could anybody help me? 


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