Analysis of Language Errors in Writing Proposals for XI Grade Students at Prima Unggul Vocational School

This study aims to describe the Indonesian language errors in writing proposals for eleventh grade students of SMK Prima Unggul. The research method used in this research is descriptive qualitative. The form of this research data is in the form of a proposal essay for eleventh grade students of SMK Prima Unggul. Data collection techniques using documentation and interview techniques. The data validity technique is data triangulation and theory triangulation. While, the data analysis technique uses interactive analysis techniques. The results of this study indicate that there are errors in Indonesian, including errors in the use of punctuation marks in the form of errors in the placement of signs ( , ) and ( . ), errors in the use of the ‘sampai dengan’ (up to) sign and errors in the use of subchapter markers. Meanwhile, errors at the morphological level are typos and the use of foreign language vocabulary that is not written in italics.