Hi all.. I am now a first-year graduate student in engineering. I have been working on a research problem for 3 months. I thought that I have solved the problem recently and wrote up a manuscript and was ready to submit that. However, suddenly, I found an error with my work and it cannot be fixed. A stupid error I made in the very beginning of the research... I feel so frustrated and shameful and start to doubt whether i should continue graduate school.... Anyone has similar experience to share..?