.xbb file contains the boundingbox information of its corresponding file. When LaTeX returns an error message "XXX.xbb" not found, we should generate .xbb file by executing the following command: extractbb XXX.pdf
.xbb file contains the boundingbox information of its corresponding file. When LaTeX returns an error message "XXX.xbb" not found, we should generate .xbb file by executing the following command: extractbb XXX.pdf