org.wso2.siddhi.query.api.exception.ExecutionPlanValidationException: substr is neither a function nor an aggregated attribute in execution plan "ce1873e8-9247-4d16-a8ee-f9146e1e8c79"

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substr is neither a function nor an aggregated attribute in execution plan "ce1873e8-9247-4d16-a8ee-f9146e1e8c79"
org.wso2.siddhi.query.api.exception.ExecutionPlanValidationException: substr is neither a function nor an aggregated attribute in execution plan "ce1873e8-9247-4d16-a8ee-f9146e1e8c79"
at org.wso2.siddhi.core.util.parser.ExpressionParser.parseExpression(ExpressionParser.java:292)
at org.wso2.siddhi.core.util.parser.ExpressionParser.parseExpression(ExpressionParser.java:319)
at org.wso2.siddhi.core.util.parser.ExpressionParser.parseExpression(ExpressionParser.java:123)
at org.wso2.siddhi.core.util.parser.SingleInputStreamParser.generateProcessor(SingleInputStreamParser.java:129)
at org.wso2.siddhi.core.util.parser.SingleInputStreamParser.parseInputStream(SingleInputStreamParser.java:86)
at org.wso2.siddhi.core.util.parser.InputStreamParser.parse(InputStreamParser.java:51)
at org.wso2.siddhi.core.util.parser.QueryParser.parse(QueryParser.java:64)
at org.wso2.siddhi.core.util.parser.QueryParser.parse(QueryParser.java:111)
at org.wso2.siddhi.core.util.parser.ExecutionPlanParser.parse(ExecutionPlanParser.java:117)
at org.wso2.siddhi.core.util.parser.ExecutionPlanParser.parse(ExecutionPlanParser.java:127)
at org.wso2.siddhi.core.SiddhiManager.createExecutionPlanRuntime(SiddhiManager.java:51)
at org.wso2.siddhi.core.SiddhiManager.createExecutionPlanRuntime(SiddhiManager.java:59)
at com.test.utils.SiddhiUtils.getExecutionPlanRuntime(SiddhiUtils.java:82)

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