Extension installer issue

Hi
I am having a problem with extension installer getting the following error message
SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

OK

<b>Warning</b>: mkdir(): No such file or directory in <b>/home/arogaya/public_html/admin/controller/extension/installer.php</b> on line <b>82</b><b>Warning</b>: move_uploaded_file(/home/arogaya/public_html/system/upload/temp-fgQliqHlWiaEDXvymf5TDHNr4p7d4AWX/upload.zip): failed to open stream: No such file or directory in <b>/home/arogaya/public_html/admin/controller/extension/installer.php</b> on line <b>117</b><b>Warning</b>: move_uploaded_file(): Unable to move '/tmp/phpuurAIL' to '/home/arogaya/public_html/system/upload/temp-fgQliqHlWiaEDXvymf5TDHNr4p7d4AWX/upload.zip' in <b>/home/arogaya/public_html/admin/controller/extension/installer.php</b> on line <b>117</b>{"step":[],"overwrite":[],"error":"File could not be found!"}


Any help advise will be welcome. Thank you
vipin