Nem sikerült feloldani a(z) '<var>Method name</var>' metódus '<var>X</var>' paraméterének a típusát. Hiányzik egy kódösszeállítás- vagy névtérhivatkozás?

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The type for parameter '<var>X</var>' of method '<var>Method name</var>' could not be resolved. Are you missing an assembly or namespace reference?

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