Unable to open a Flow with error An error has occurred, please try again or check the logs for more information.Issue Flow will not open, error An error has occurred, please try again or check the logs for more information. Browser would show : Failed to load resource: the server responded with a status of 500 (Internal Server Error) Node logs: 10:05:25.018 Info Default-thread-15 B5B0164D1B046850FB660D43CD4BCB76 txid=4d89d6091b44 #411810 /api/now/processflow/flow/802461b81bc8e450fb660d43cd4bcb25 Parameters -------------------------api=api10:05:25.018 Info Default-thread-15 B5B0164D1B046850FB660D43CD4BCB76 txid=4d89d6091b44 *** Start #411810 /api/now/processflow/flow/802461b81bc8e450fb660d43cd4bcb25, user: xxxxxxxx10:05:25.042 Warning Default-thread-15 B5B0164D1B046850FB660D43CD4BCB76 txid=4d89d6091b44 WARNING *** WARNING *** Get for non-existent record: sys_hub_trigger_input:9bc02091c36813002841b63b12d3ae80, initializing10:05:25.077 Info Default-thread-15 B5B0164D1B046850FB660D43CD4BCB76 txid=4d89d6091b44 Complex type redefined: FlowDesigner:FD0a141355ed2f101036ad602af0f83af310:05:25.082 Error Default-thread-15 B5B0164D1B046850FB660D43CD4BCB76 txid=4d89d6091b44 SEVERE *** ERROR *** Flow Designer: nullcom.snc.cobject.ComplexObject.<init>(ComplexObject.java:74)com.snc.cobject.ComplexObject.<init>(ComplexObject.java:51)com.snc.cobject.ComplexObject.<init>(ComplexObject.java:43)com.snc.cobject.ComplexObject.<init>(ComplexObject.java:39)com.glide.flow_design.helpers.ComplexObjectHelper.getFlowDesignerComplexObject(ComplexObjectHelper.java:472)com.glide.flow_design.helpers.ComplexObjectHelper.getInstanceValues(ComplexObjectHelper.java:430)com.glide.flow_design.helpers.ComponentInstanceHelper.populateInstanceValueFromElement(ComponentInstanceHelper.java:265)com.glide.flow_design.helpers.ComponentInstanceHelper.lambda$getActionInstanceValuesFromElement$6(ComponentInstanceHelper.java:230)CausePRB1445035 There is an action in the flow that has an input and attribute "co_type_name" is defined but is of type other than complex object (usually array).Resolution Removing the attribute co_type_name fixed the issue by going through /sys_hub_action_input records and check the actions used on the affected flow. If input is not a complex object, attribute should not exist.