TeskLink问题—导入需求类testCase报错 （version1.9.8）

TestLink导入需求类测试用例的时候，报下面错误： 
前台页面报的错误 

#0  database->exec_query() called at [C:\xampp\htdocs\testlink\lib\functions\requirement_mgr.class.php:1000]  
#1  requirement_mgr->assign_to_tcase() called at [C:\xampp\htdocs\testlink\lib\testcases\tcImport.php:668]  
#2  processRequirements() called at [C:\xampp\htdocs\testlink\lib\testcases\tcImport.php:453]  
#3  saveImportedTCData() called at [C:\xampp\htdocs\testlink\lib\testcases\tcImport.php:938]  
#4  importTestSuitesFromSimpleXML() called at [C:\xampp\htdocs\testlink\lib\testcases\tcImport.php:945]  
#5  importTestSuitesFromSimpleXML() called at [C:\xampp\htdocs\testlink\lib\testcases\tcImport.php:945]  
#6  importTestSuitesFromSimpleXML() called at [C:\xampp\htdocs\testlink\lib\testcases\tcImport.php:169]  
#7  importTestCaseDataFromXML() called at [C:\xampp\htdocs\testlink\lib\testcases\tcImport.php:76]  

后台日志报的错误：

Query failed: errorcode[1064]  
     errormsg:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''2013-10-21 10:07:18')' at line 1   
     [13/Oct/21 08:07:18][AUDIT][ftp6i7qei5rdhl2aruqrspg3g1][GUI]  
          Requirement with title '编号XQ3' was assigned to the Test Case '需求NO-2编号XQ2--测试第三环节' 

报错是由于插入需求覆盖表req_coverage的SQL有问题，其中author_id传入的字符串 

修改程序： 
testlink\lib\testcases\tcImport.php 668行， 
  $reqMgr->assign_to_tcase($cachedReqSpec[$value[ 'req_spec_title']]['req' ][$value['doc_id']],$tcaseId,1); 
加入传入 author_id 字段，由于项目的需求，默认写成 1 ，为admin用户