i cannot knit to pdf

i installed the tinytex and done the
install.packages("tinytex")
tinytex::install_tinytex()

still cannot knit to pdf

! Package inputenc Error: Unicode character 伪 (U+03B1)
(inputenc) not set up for use with LaTeX.

Try other LaTeX engines instead (e.g., xelatex) if you are using pdflatex. See 6.7 Render documents containing Unicode characters | R Markdown Cookbook
Error: LaTeX failed to compile project-report-2.tex. See The R package tinytex - Helper Functions to Manage TinyTeX, and Compile LaTeX Documents - Yihui Xie | 谢益辉 for debugging tips. See project-report-2.log for more info.
In addition: There were 27 warnings (use warnings() to see them)
Execution halted