Failed to merge imodels using transformer related methods

[MYDJH]

"I encountered some issues while using the transformer to merge two iModels. When executing the method, I encountered error messages. I tried several approaches to merge, but all of them failed."

Attempting solutions 1:

async count(iModelDb: IModelDb, classFullName: string): Promise<number> {
    return iModelDb.withPreparedStatement(
      `SELECT COUNT(*) FROM ${classFullName}`,
      (statement: ECSqlStatement): number => {
        return DbResult.BE_SQLITE_ROW === statement.step()
          ? statement.getValue(0).getInteger()
          : 0;
      }
    );
  }
  async mergeFrist(req: any, res: any): Promise<string> {
    IModelHost.startup();
    const SourceFileName1 = "C:\\Users\\wwr\\Downloads\\a\\a.bim";
    const sourceFileName2 = "C:\\Users\\wwr\\Downloads\\b\\b.bim";
    const targetFile = "C:\\Users\\wwr\\Downloads\\c\\c.bim";

    const SrouceModel1 = SnapshotDb.openFile(SourceFileName1);
    const SrouceModel2 = SnapshotDb.openFile(sourceFileName2);

    const num1 = await this.count(SrouceModel1, "BisCore.Element"); 
    const num2 = await this.count(SrouceModel2, "BisCore.Element"); 
    console.log("num1 = " + num1.toString()); //Output 1194
    console.log("num2 = " + num2.toString()); //Output 11943
    if (IModelJsFs.existsSync(targetFile)) {
      IModelJsFs.removeSync(targetFile);
    }
    const targetDbProps: CreateIModelProps = {
      rootSubject: { name: "Clone-Target" },
      ecefLocation: SrouceModel1.ecefLocation,
    };
    // Create a blank Imodel
    const targetDb = SnapshotDb.createEmpty(targetFile, targetDbProps);
    const transformer = new IModelTransformer(SrouceModel1,targetDb);
    await transformer.processSchemas();//Error Message：Error importing schema
    await transformer.processAll();//Error Message：attempt to clone with unknown class
    targetDb.saveChanges();

    const num4 = await this.count(targetDb, "BisCore.Element");

    SrouceModel1.close();
    targetDb.close();
    SrouceModel2.close();

    IModelHost.shutdown();
    return "Frist";
  }

Error Message：Error importing schema;
Error Message：attempt to clone with unknown class;

Attempting solutions 2:

  async mergeSecond(req: any, res: any): Promise<string> {
    IModelHost.startup();
    const SourceFileName1 = "C:\\Users\\wwr\\Downloads\\a\\a.bim";
    const sourceFileName2 = "C:\\Users\\wwr\\Downloads\\b\\b.bim";
    const SrouceModel1 = SnapshotDb.openFile(SourceFileName1);
    const SrouceModel2 = SnapshotDb.openFile(sourceFileName2);
    const num1 = await this.count(SrouceModel1, "BisCore.Element"); //1194
    const num2 = await this.count(SrouceModel2, "BisCore.Element"); //11943
    const targetFileName = "C:\\Users\\wwr\\Downloads\\c\\c.bim";
    if (IModelJsFs.existsSync(targetFileName)) {
      IModelJsFs.removeSync(targetFileName);
    }
    const targetDbProps: CreateIModelProps = {
      rootSubject: { name: "Clone-Target" },
      ecefLocation: SrouceModel1.ecefLocation,
    };
    
    // Create a readable and writable file using a seed
    let TargetIModel1 = SnapshotDb.createFrom(SrouceModel1, targetFileName);
    const parentSubject = TargetIModel1.elements.getRootSubject().id;
    const subjectId1 = Subject.insert(TargetIModel1, parentSubject, "subject1");
    const subjectId2 = Subject.insert(TargetIModel1, parentSubject, "subject2");

    if (TargetIModel1.isReadonly) {
      console.log("readable");
    } else {
      console.log("readable and writable");
    }
    const transformer = new IModelTransformer(SrouceModel2,TargetIModel1,{
      targetScopeElementId: subjectId1,
    });
    await transformer.processSchemas();
    await transformer.processAll();//Error Error: attempt to clone with unknown class
    TargetIModel1.saveChanges();
    const num4 = await this.count(TargetIModel1, "BisCore.Element");
    SrouceModel1.close();
    SrouceModel2.close();
    TargetIModel1.close();
    return "Second";
  }
}

The actual error location is reported when executing the transformer. processAll() method

  public async processAll(): Promise<void> {
    Logger.logTrace(loggerCategory, "processAll()");
    this.logSettings();
    this.validateScopeProvenance();
    await this.initialize();
    await this.exporter.exportCodeSpecs();
    await this.exporter.exportFonts();
    await this.exporter.exportChildElements(IModel.rootSubjectId); Subject
    await this.exporter.exportModelContents(IModel.repositoryModelId, Element.classFullName, true);
    await this.exporter.exportSubModels(IModel.repositoryModelId); //Actual Error Position
    await this.exporter["exportAllAspects"](); 
    await this.exporter.exportRelationships(ElementRefersToElements.classFullName);
    await this.processDeferredElements();
    if (this.shouldDetectDeletes()) {
      await this.detectElementDeletes();
      await this.detectRelationshipDeletes();
    }

    if (this._options.optimizeGeometry)
      this.importer.optimizeGeometry(this._options.optimizeGeometry);

    this.importer.computeProjectExtents();
    this.finalizeTransformation();
  }

Error Message：Error Error: attempt to clone with unknown class

"I sincerely hope for your assistance in analyzing whether the problem resides within my code or the environment. Additionally, any insights or suggestions you may have for an improved implementation plan would be greatly appreciated. Thank you for your consideration and help."

[MYDJH]

The file I want to merge is.
mergeFile.zip

[pmconne]

Duplicate of #6487