Error analysis plays a significant role in second/ foreign language learning. It corrects and analyzes the student's errors in SLA as well as it provides teachers with plenty of strategies and techniques which help the students and the teachers to avoid or reduce learning errors. The present research was conducted to analyze the grammatical errors in written work. S.P Corder, the Significance of learner's errors, is the theoretical background of the study. His three steps of analysis used as an instrument. The hypothesis is that grammatical errors frequently occur in second language learners' writings due to some hidden psychological issues. It is essential to learn which error should be corrected. For the purpose to diagnose the psychological problems, WURS has used as an instrument to diagnose these issues. Therapeutic techniques can be used to reduce these grammatical errors. The mixed paradigm used in this research. The researcher used pre-test and post-test for the data collection. The researcher has analyzed the writings of students of Sialkot especially government schools. The study is limited to syntactical analysis. Future researchers can study other aspects of language.