Issue in upload file via Aspose Doc Importer plugin

Hi,
I got some time error while imporing docx file like “Warning : fopen /plugins/aspose-doc-importer/Aspose_Cloud_SDK_For_PHP-master/src/Aspose/Cloud/Common/Utils.php on line 138”.

And in Aspose Doc Importer root error_log indicate error like

[05-Jan-2017 17:33:11 UTC] PHP Warning: fopen(/home/projectname/public_html/wp-content/uploads/2017/01/new-do.docx): failed to open stream: No such file or directory in /home/projectname/public_html/wp-content/plugins/aspose-doc-importer/Aspose_Cloud_SDK_For_PHP-master/src/Aspose/Cloud/Common/Utils.php on line 138

[05-Jan-2017 17:33:11 UTC] PHP Warning: curl_setopt(): supplied argument is not a valid File-Handle resource in /home/projectname/public_html/wp-content/plugins/aspose-doc-importer/Aspose_Cloud_SDK_For_PHP-master/src/Aspose/Cloud/Common/Utils.php on line 151

[05-Jan-2017 17:33:11 UTC] PHP Warning: filesize(): stat failed for /home/projectname/public_html/wp-content/uploads/2017/01/new-do.docx in /home/projectname/public_html/wp-content/plugins/aspose-doc-importer/Aspose_Cloud_SDK_For_PHP-master/src/Aspose/Cloud/Common/Utils.php on line 152

[05-Jan-2017 17:33:11 UTC] PHP Warning: fclose() expects parameter 1 to be resource, boolean given in /home/projectname/public_html/wp-content/plugins/aspose-doc-importer/Aspose_Cloud_SDK_For_PHP-master/src/Aspose/Cloud/Common/Utils.php on line 155

What is exact solution for this error?

It only happen some time not every time.