The method amountOfIndentChars() does not exist on Pluswerk\TypoScriptAutoFixer\Issue\AbstractIssue. It seems like you code against a sub-type of Pluswerk\TypoScriptAutoFixer\Issue\AbstractIssue such as Pluswerk\TypoScriptAutoF...\Issue\IndentationIssue.
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Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation
The method indentationCharacter() does not exist on Pluswerk\TypoScriptAutoFixer\Issue\AbstractIssue. It seems like you code against a sub-type of Pluswerk\TypoScriptAutoFixer\Issue\AbstractIssue such as Pluswerk\TypoScriptAutoF...\Issue\IndentationIssue.
(
Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation