updated error message on cf init

application/src/main/java/org/thingsboard/server/actors/calculatedField/CalculatedFieldManagerMessageProcessor.java

@@ -262,7 +262,7 @@ public class CalculatedFieldManagerMessageProcessor extends AbstractContextAware
                 try {
                     cfCtx.init();
                 } catch (Exception e) {
-                    throw CalculatedFieldException.builder().ctx(cfCtx).eventEntity(cf.getEntityId()).cause(e).errorMessage("Failed to initialize CF context").build();
+                    throw CalculatedFieldException.builder().ctx(cfCtx).eventEntity(cf.getEntityId()).cause(e).errorMessage(e.getMessage()).build();
                 }
                 calculatedFields.put(cf.getId(), cfCtx);
                 // We use copy on write lists to safely pass the reference to another actor for the iteration.
@@ -289,7 +289,7 @@ public class CalculatedFieldManagerMessageProcessor extends AbstractContextAware
                 try {
                     newCfCtx.init();
                 } catch (Exception e) {
-                    throw CalculatedFieldException.builder().ctx(newCfCtx).eventEntity(newCfCtx.getEntityId()).cause(e).errorMessage("Failed to initialize CF context").build();
+                    throw CalculatedFieldException.builder().ctx(newCfCtx).eventEntity(newCfCtx.getEntityId()).cause(e).errorMessage(e.getMessage()).build();
                 } finally {
                     calculatedFields.put(newCf.getId(), newCfCtx);
                     List<CalculatedFieldCtx> oldCfList = entityIdCalculatedFields.get(newCf.getEntityId());
@@ -552,7 +552,7 @@ public class CalculatedFieldManagerMessageProcessor extends AbstractContextAware
         try {
             cfCtx.init();
         } catch (Exception e) {
-            throw CalculatedFieldException.builder().ctx(cfCtx).eventEntity(cf.getEntityId()).cause(e).errorMessage("Failed to initialize CF context").build();
+            throw CalculatedFieldException.builder().ctx(cfCtx).eventEntity(cf.getEntityId()).cause(e).errorMessage(e.getMessage()).build();
         } finally {
             calculatedFields.put(cf.getId(), cfCtx);
             // We use copy on write lists to safely pass the reference to another actor for the iteration.

application/src/main/java/org/thingsboard/server/service/cf/ctx/state/CalculatedFieldCtx.java

@@ -114,7 +114,7 @@ public class CalculatedFieldCtx {
                 initialized = true;
             } catch (Exception e) {
                 initialized = false;
-                throw new RuntimeException("Failed to init calculated field ctx. Invalid expression syntax.", e);
+                throw new RuntimeException("Failed to initialize CF context. The script expression is invalid. Please check for syntax errors or unsupported functions.", e);
             }
         } else {
             if (isValidExpression(expression)) {
@@ -128,7 +128,7 @@ public class CalculatedFieldCtx {
                 initialized = true;
             } else {
                 initialized = false;
-                throw new RuntimeException("Failed to init calculated field ctx. Invalid expression syntax.");
+                throw new RuntimeException("Failed to initialize CF context. The expression has invalid syntax or unknown variables. Ensure all mathematical operators are correct.");
             }
         }
     }