HTTP Status 500 - String index out of range: -6

type Exception report\r

message String index out of range: -6\r

description The server encountered an internal error that prevented it from fulfilling this request.\r

exception

java.lang.StringIndexOutOfBoundsException: String index out of range: -6

java.lang.String.substring(Unknown Source)

com.lib.DecryptUtil.fileDecrypt(DecryptUtil.java:22)

coe(Action.java:59)

sun.reflect.Generatedessor38.invoke(Unknown Source)

sun.reflect.Delegatingpl.invoke(Unknown Source)

java.lang.reflect.Method.invoke(Unknown Source)

com.opensyctionInvocation.invokeAction(DefaultActionInvocation.java:452)

com.opensyctionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)

com.opensyctionInvocation.invoke(DefaultActionInvocation.java:254)

com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)

com.opensyethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

com.opensyctionInvocation.invoke(DefaultActionInvocation.java:248)

com.opensytor.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)

org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)

com.opensyethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)

com.opensyctionInvocation.invoke(DefaultActio