"injectors not detected" and "no injectors" under my loading method

Hi guys, when I tried to run my sequence in GC-FID, the workstation showed "front injectors not detected", and under my method, the configuration showed no injectors. However, the parameters I entered for injection could be found in the GC (7890A) operation panel. I am wondering how to fix it. Please give me some hints under such a circumstance. Thanks! 

BTW, before I use the GC-FID, one of my colleagues was using GC-MS; so when I started my work, I just simply moved the autosampler from the back inlet to the front. Is it correct? 





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