diff --git a/api/src/engine/connectors/exareme/converters.ts b/api/src/engine/connectors/exareme/converters.ts
index 3c32f756990463f4e7256af71b4bfc9c424160b8..517f6d598a704d3e6de736c8653b58a56c00e4fc 100644
--- a/api/src/engine/connectors/exareme/converters.ts
+++ b/api/src/engine/connectors/exareme/converters.ts
@@ -220,8 +220,17 @@ export const dataToExperiment = (
 
     return exp;
   } catch (e) {
-    //TODO : Add logger can't convert experiment
-    return undefined;
+    return {
+      id: data.uuid,
+      name: data.name,
+      status: 'error',
+      variables: [],
+      domain: data['domain'] ?? '',
+      datasets: [],
+      algorithm: {
+        id: 'unknown',
+      },
+    };
   }
 };
 
@@ -229,10 +238,19 @@ export const dataToAlgorithms = (data: string): Algorithm[] => {
   return transformToAlgorithms.evaluate(data);
 };
 
-export const dataToRaw = (result: ResultExperiment): RawResult[] => {
+export const dataToRaw = (
+  algo: string,
+  result: ResultExperiment,
+): RawResult[] => {
+  let data = result;
+
+  if (algo === 'CART') {
+    data = { ...data, type: 'application/binary-tree+json' };
+  }
+
   return [
     {
-      rawdata: result,
+      rawdata: data,
     },
   ];
 };
@@ -247,7 +265,7 @@ export const dataToResult = (
     case 'application/vnd.highcharts+json':
       return dataHighchartToResult(result as ResultChartExperiment, algo);
     default:
-      return dataToRaw(result);
+      return dataToRaw(algo, result);
   }
 };
 
@@ -259,7 +277,7 @@ export const dataJSONtoResult = (
     case 'descriptive_stats':
       return descriptiveDataToTableResult(result);
     default:
-      return dataToRaw(result);
+      return dataToRaw(algo, result);
   }
 };
 
@@ -273,6 +291,6 @@ export const dataHighchartToResult = (
     case 'area':
       return [dataROCToLineResult.evaluate(result) as LineChartResult];
     default:
-      return dataToRaw(result);
+      return dataToRaw(algo, result);
   }
 };
diff --git a/api/src/engine/connectors/exareme/interfaces/experiment/experiment.interface.ts b/api/src/engine/connectors/exareme/interfaces/experiment/experiment.interface.ts
index 7412cb0560c9eda88fe61dd4ebbf8128c94e2c62..cd5ceb45a4539812ec15cb94755f2302bb99de63 100644
--- a/api/src/engine/connectors/exareme/interfaces/experiment/experiment.interface.ts
+++ b/api/src/engine/connectors/exareme/interfaces/experiment/experiment.interface.ts
@@ -5,6 +5,7 @@ export interface ExperimentData {
   uuid?: string;
   status?: string;
   createdBy?: string;
+  created: string;
   shared?: boolean;
   viewed?: boolean;
   result?: ResultExperiment[];
diff --git a/api/src/engine/connectors/exareme/main.connector.ts b/api/src/engine/connectors/exareme/main.connector.ts
index ffd1daf11b65456986db78aa5a7ed8d5d6d1bb20..5733366f9125337a555ff7f7df7faad52dae6627 100644
--- a/api/src/engine/connectors/exareme/main.connector.ts
+++ b/api/src/engine/connectors/exareme/main.connector.ts
@@ -74,9 +74,7 @@ export default class ExaremeService implements IEngineService {
 
     return {
       ...resultAPI.data,
-      experiments:
-        resultAPI.data.experiments?.map(dataToExperiment).filter((r) => r) ??
-        [],
+      experiments: resultAPI.data.experiments?.map(dataToExperiment) ?? [],
     };
   }
 
diff --git a/api/src/engine/connectors/exareme/transformations.ts b/api/src/engine/connectors/exareme/transformations.ts
index 439f2560f505f1ed4ad477a9f8fb688e7c6b77b9..2dcc462c495614b05cb763225ac75d1804a014c5 100644
--- a/api/src/engine/connectors/exareme/transformations.ts
+++ b/api/src/engine/connectors/exareme/transformations.ts
@@ -31,10 +31,9 @@ export const transformToAlgorithms = jsonata(`
 export const transformToExperiment = jsonata(`
 ( 
     $params := ["y", "pathology", "dataset", "filter", "x"];
-
     $toArray := function($x) { $type($x) = 'array' ? $x : [$x]};
-    
     $convDate := function($v) { $type($v) = 'string' ? $toMillis($v) : $v };
+    $rp := function($v) {$replace($v, /(\\+|\\*|-)/, ',')};
 
     {
         "name": name,
@@ -47,8 +46,8 @@ export const transformToExperiment = jsonata(`
         "shared": shared,
         "updateAt": $convDate(updated),
         "domain": algorithm.parameters[name = "pathology"].value,
-        "variables": $split(algorithm.parameters[name = "y"].value, ','),
-        "coVariables": $toArray($split(algorithm.parameters[name = "x"].value, ',')),
+        "variables": $split($rp(algorithm.parameters[name = "y"].value), ','),
+        "coVariables": $toArray($split($rp(algorithm.parameters[name = "x"].value), ',')),
         "filter": algorithm.parameters[name = "filter"].value,
         "datasets": $split(algorithm.parameters[name = "dataset"].value, ','),
         "algorithm": {
diff --git a/api/src/engine/engine.module.ts b/api/src/engine/engine.module.ts
index 48442588a8d1a2c5120e99fa15d60e7da3c29739..6f8d33c6a63b40a9ac2c07a5bf3983ae0e148775 100644
--- a/api/src/engine/engine.module.ts
+++ b/api/src/engine/engine.module.ts
@@ -53,10 +53,11 @@ export class EngineModule {
       const engine = new service.default(options, httpService, req);
 
       return engine;
-    } catch {
+    } catch (e) {
       this.logger.error(
         `There is a problem with the connector '${options.type}'`,
       );
+      this.logger.verbose(e);
       process.exit(); // We can't continue without an engine, shutdown the process...
     }
   }