java.lang.ClassCastException: java.lang.Object cannot be cast to ru.runa.wfe.var.file.IFileVariable

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java.lang.ClassCastException: java.lang.Object cannot be cast to ru.runa.wfe.var.file.IFileVariable	at ru.runa.wf.web.ftl.method.ViewUtil.getComponentInput(ViewUtil.java:308)	at ru.runa.wf.web.ftl.method.ViewUtil.getComponentInput(ViewUtil.java:439)	at ru.runa.wf.web.ftl.method.InputVariableTag.executeTag(InputVariableTag.java:13)	at ru.runa.wfe.commons.ftl.FreemarkerTag.exec(FreemarkerTag.java:60)	at freemarker.core.MethodCall._getAsTemplateModel(MethodCall.java:93)	at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)	at freemarker.core.Expression.getStringValue(Expression.java:93)	at freemarker.core.DollarVariable.accept(DollarVariable.java:76)