r studio cloud error

Hi, can anyone help me solve this error on r studio cloud, It happen when knit the document.
! Package inputenc Error: Unicode character α (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 FinalTermProjectlast.tex. See The R package tinytex - Helper Functions to Manage TinyTeX, and Compile LaTeX Documents - Yihui Xie | 谢益辉 for debugging tips. See FinalTermProjectlast.log for more info.
In addition: Warning messages:
1: Removed 3 rows containing missing values (geom_point).
2: Removed 3 rows containing non-finite values (stat_bin).
Execution halted

Did you follow this advice in the error message shown ?