We are upgrading Appian from 7.2 to Appian 7.6 and we have received below error

We are upgrading Appian from 7.2 to Appian 7.6 and we have received below error very first moments.

<server .log starts ----------------------------------------->
16:42:31,523 INFO [stdout] (ServerService Thread Pool -- 73) 2014-08-26 16:42:31,523 [ServerService Thread Pool -- 73] ERROR com.appiancorp.common.config.ConfigObject - An error occurred while trying to initialize the config object com.appiancorp.type.config.plugin.PojoDatatypesConfig

16:42:31,523 INFO [stdout] (ServerService Thread Pool -- 73) com.appiancorp.type.config.pojo.PojoTypeImportException: Could not create types for [class com.appiancorp.type.cdt.AnyLinkField, class com.appiancorp.type.cdt.ApplicationHeaderLayout, class com.appiancorp.type.cdt.HeaderBodyLayout, class com.appiancorp.type.cdt.BarChart, class com.appiancorp.type.cdt.BooleanField, class com.appiancorp.type.cdt.Breadcrumbs, class com.appiancorp.type.cdt.ButtonLayout, class com.appiancorp.type.cdt.B...

server.log

OriginalPostID-120442

OriginalPostID-120442