Learning mathematics has given rise to the assumption that mathematics is one of the difficult subjects in school. An analysis that examines the mistakes made by students in completing various mathematical questions, one of them is analysis based on SOLO taxonomy. This research aims to describe the types of student errors and analyze the factors that cause students to make mistakes in solving vector problems which are reviewed from the SOLO taxonomy. This type of research is qualitative descriptive involving 24 students of class XI TKJ at Surakarta Batik 1 Vocational School. Data collection techniques in this study include documentation and interviews, while analyzing data through data reduction, data presentation and conclusion drawing. The results of this research indicate the types of student errors in solving vector problems which are reviewed from the SOLO taxonomy with the size of the presentation namely prestructural level 15.28%, unistructural level 6.95%, multistructural level 30.55%, relational level 33.33% and extended abstract level 13.89%. Factors that cause students to make mistakes include not being careful when working on answers, using the wrong formula, hurrying to do answers, not understanding the concept of vector calculations
