my rar folder has 755 CHMOD. what could be the possible solution?

Code: 
===plusrar version===
4.1
===php_uname===
Linux 2.6.18-194.17.1.el5.028stab070.7 #1 SMP Fri Oct 1 14:17:14 MSD 2010 i686
===safe_mode===
off
===rar executable info===
rar 3.80 for Linux with permissions 0755
===Return code===
-1
===Error===
Error openning rar process
===Executed command===
'/home/*******/public_html/rar/rar' a -ierr -ep -o- -m0 -s-  -x*.htaccess -x*.htpasswd -x*.php -x*.php3 -x*.php4 -x*.php5 -x*.phtml -x*.asp -x*.aspx -x*.cgi -- '/home/*******/public_html/files/1.rar' '/home/*******/public_html/files/HQ_-_GABB3R_-_3D_Text_Tutorial.rar' '/home/*******/public_html/files/sdbrbrfvbh.mp4'
tractor3231 Reviewed by tractor3231 on . Rapidleech error: Error openning rar process my rar folder has 755 CHMOD. what could be the possible solution? ===plusrar version=== 4.1 ===php_uname=== Linux 2.6.18-194.17.1.el5.028stab070.7 #1 SMP Fri Oct 1 14:17:14 MSD 2010 i686 ===safe_mode=== off ===rar executable info=== rar 3.80 for Linux with permissions 0755 Rating: 5