# Revision history [back]

### OpenCV + QTCreator -> cannot read file from hard disk?

Hi,

I wanted to switch from Code::Blocks to QTCreator after formatting my hard disk. But when I want to use the code I was compiling before without any errors, I now get an errormessage

/usr/include/opencv2/core/operations.hpp:2794: error: no matching function for call to 'read(cv::FileNodeIterator, std::vector<cv::KeyPoint>&)'


when I execute the following:

std::vector<cv::keypoint> key2

cv::FileStorage fs("keypoint.yml", cv::FileStorage::READ);
cv::FileNode  kptFileNode1 = fs["Class1"];