spire.doc can not convert data from doc/rtf file to pdf - spire.doc

I am using spire.office. It is converting data from excel to pdf successfully but not from the document or RTF file. It is showing the following error
Could not load type 'spr᝚' from assembly 'Spire.Doc, Version=7.1.13.41046, Culture=neutral, PublicKeyToken=663f351905198cb3' because it attempts to implement a class as an interface.
Please check it and gives some advice. Thanks in advance
File.WriteAllText(filepath + ".rtf", fileText);
Document doc = new Document(filepath + ".docx", Spire.Doc.FileFormat.Docx);
//doc.LoadFromFile(filepath + ".docx",Spire.Doc.FileFormat.Docx);
doc.SaveToFile(filepath + ".pdf");

When converting files to PDF, you also need to add Spire.Pdf.dll. If not, it might throw that kind of "spr" error. Additionally, you should specify the FileFormat as PDF: doc.SaveToFile(filepath + ".pdf", FileFormat.PDF);

Do you load license beforehand?
Spire.License.LicenseProvider.SetLicenseFileName("license.elic.xml");
Spire.License.LicenseProvider.LoadLicense();

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Minimal working code for creating an Excel file and adding to it JMeter variable value looks like:
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
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I had the similar issue - corrupted binary pic. upon the download.
Then while downloading TXT/XML files, I have noticed few blank lines at the beginning the text body.
Using the suggestion above on JSP, I removed all line breaks in my JSP page which manages the download.
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<jsp:useBean.. ><%..response. ;response.setStatus(HttpServletResponse.SC_RESET_CONTENT);return; %>
This removed extra blank lines in TXT/XML and solved binary corruption issue as well.
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