vspace warnings

[KDLPro]

Here's the command line response after making a TeX file and I'm not sure why it was triggered. Do you guys have any idea why it happens? Your help is much appreciated.

(c:/texlive/2024/texmf-dist/tex/latex/upquote/upquote.sty) (c:/texlive/2024/texmf-dist/tex/latex/ninecolors/ninecolors.sty (c:/texlive/2024/texmf-dist/tex/latex/l3packages/xparse/xparse.sty)) (c:/texlive/2024/texmf-dist/tex/latex/translations/translations-basic-dictionary-english.trsl) (./Abstract.tex) Excluding 'CCSXML' comment. (c:/texlive/2024/texmf-dist/tex/latex/libertine/T1LinuxBiolinumT-TLF.fd) (c:/texlive/2024/texmf-dist/tex/latex/libertine/TS1LinuxLibertineT-TLF.fd)

Class acmart Warning: \vspace should only be used to provide space above/below surrounding objects on input line 179.

(c:/texlive/2024/texmf-dist/tex/latex/microtype/mt-msa.cfg) (c:/texlive/2024/texmf-dist/tex/latex/microtype/mt-msb.cfg)

Class acmart Warning: \vspace should only be used to provide space above/below surrounding objects on input line 179.


LaTeX Warning: Reference `TotPages' on page 1 undefined on input line 179.```