When I'm trying to approve an request it calls an authorization screen where I'm getting this error

Error Evaluating UI Expression Expression evaluation error [evaluation ID = 6b656:9a842] in rule 'authorization_screen' : class java.lang.String cannot be cast to class com.appiancorp.core.data.Dictionary (java.lang.String is in module java.base of loader 'bootstrap'; com.appiancorp.core.data.Dictionary is in unnamed module of loader com.appiancorp.tomcat.loader.AppianWebappClassLoader @280e8a1a)