Error with Detected Time points

Hello everyone, I am just beginning my resting state fMRI analysis, and I have been running into an error. I have created a folder in the working directory called FunImg, where I have added folders for each subject. In that folder, I added the .img file for the resting state scan. Therefore, the file path is created as follows: Working Directory\FunImg\Subject#\rest#.img In addition, I have included another folder in the Working Directory named T1Img, which includes the structural files in .img format in a manner similar to the resting state scan. However, when I attempt to begin my analysis, I get an error which states: "The detected time points of subject "XXXX" is: 0, it is different from the predefined time points: 150. Please check your data!" Any insight as to why I am receiving this error? Thank you