freemarker.core.NonStringException: [... Exception message was already printed; see it above ...]

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[... Exception message was already printed; see it above ...]
freemarker.core.NonStringException: [... Exception message was already printed; see it above ...]
at freemarker.core.EvalUtil.coerceModelToTextualCommon(EvalUtil.java:494)
at freemarker.core.EvalUtil.coerceModelToStringOrUnsupportedMarkup(EvalUtil.java:407)
at freemarker.core.Expression.evalAndCoerceToStringOrUnsupportedMarkup(Expression.java:107)
at freemarker.core.BuiltInForString.getTargetString(BuiltInForString.java:34)
at freemarker.core.BuiltInForString._eval(BuiltInForString.java:29)
at freemarker.core.Expression.eval(Expression.java:81)
at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:96)
at freemarker.core.DollarVariable.accept(DollarVariable.java:59)
at freemarker.core.Environment.visit(Environment.java:362)
at freemarker.core.Environment.visitAndTransform(Environment.java:460)
at freemarker.core.BlockAssignment.accept(BlockAssignment.java:55)
at freemarker.core.Environment.visit(Environment.java:326)
at freemarker.core.Environment.visit(Environment.java:332)
at freemarker.core.Environment.process(Environment.java:305)

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