prov:value
| - 21 (1) Substantial compliance only with Sections 19 and 20 shall be required, and no lien shall be invalidated by reason of the failure to comply with any of the requisites of such Sections, unless, in the opinion of the court or judge who has the power to try the action under this Act, the owner, contractor, subcontractor, mortgagee or other person, as the case may be, is prejudiced thereby, and
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