Importing WorkItems

Hi,
I want to import/add workitems to Jazz from my bug log file.

I've tried in two ways:

1. Import Bugzilla Bug reports
- I took Xml Example from
https://jazz.net/learn/LearnItem.jsp?href=content/tech-notes/rational-team-concert-1_0-importing-work-items/index.html

<xml>
<bugzilla>
<bug>
<bug_id>123</bug_id>
<creation_ts>2007-03-26 14:48 -0400</creation_ts>
<short_desc>Summary content</short_desc>
<delta_ts>2007-10-18 14:23:52 -0400</delta_ts>
<product>Product</product>
<component>Component</component>
<version>2.0</version>
<rep_platform>PC</rep_platform>
<op_sys>Windows XP</op_sys>
<bug_status>RESOLVED</bug_status>
<resolution>WORKSFORME</resolution>
<keywords>tag1, tag2</keywords>
<priority>P2</priority>
<bug_severity>normal</bug_severity>
<target_milestone>2.1</target_milestone>
<blocked>124</blocked>
<blocked>125</blocked>
<dependson>121</dependson>
<dependson>122</dependson>
<reporter>contributor2</reporter>
<assigned_to>contributor1</assigned_to>
<cc>contributor3</cc>
<cc>contributor4</cc>
<long_desc>
<who>contributor2</who>
<bug_when>2007-03-26 14:48:21 -0400</bug_when>
<thetext>Comment content 0</thetext>
</long_desc>
<long_desc>
<who>contributor1</who>
<bug_when>2007-10-18 14:23:52 -0400</bug_when>
<thetext>Comment content 1</thetext>
</long_desc>
<attachment>
<attachid>file1.txt</attachid>
<desc>Attachment description 1</desc>
</attachment>
<attachment>
<attachid>file2.txt</attachid>
<desc>Attachment description 2</desc>
</attachment>
</bug>
</bugzilla>

- I created 123.xml file and 123 folder with file1.txt and file2.txt
- I created zip file

and tried import by RTC.

I got error:
"Could not create work item from bug 123
'Save Category' failed. Permission denied."

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2. Programmatic WorkItem Creation
I tried to run example, which is on this page:
https://jazz.net/wiki/bin/view/Main/ProgrammaticWorkItemCreation

- I changed only login properties. I connect to repository properly.

- In code fragment:

List<String> path= Arrays.asList(categoryName.split("/"));

workItemClient.createCategory(projectArea, categoryName, null);
ICategoryHandle category= workItemClient.findCategoryByNamePath(projectArea, path, null);
if (category == null) {
System.out.println("Category not found.");
return false;
}

I have always "Category not found".

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Do you know, what my problem is? What "Category" is? How can I import workItems in another way?

Thank you :)
Anna