\sectionspace e \begin{tightitemize} undefined control sequence

[SquaredPi]

I get the following errors:

• Undefined control sequence. [\sectionspace]
• LaTeX Error: Environment tightitemize undefined. [\begin{tightitemize}]

Also, when I try to redefine the tightitemize environment into the document, I get an "already defined environment".

Please advice.
Thank you

[rhuddles]

Having the same issue

[CorbanR]

same issue

[hawkins]

Have any of you tried \sectionsep?

[MarcoGiancarli]

Replace all instances of \sectionspace with \sectionsep and all instances of \tightitemize with \tightemize