Erro ao passar paramentro

Siga a stack abaixo

Exception in thread "main" java.lang.NullPointerException
    at java.lang.Class.isAssignableFrom(Native Method)
    at net.sf.jasperreports.engine.fill.JRFillTextField.getFormat(JRFillTextField.java:706)
    at net.sf.jasperreports.engine.fill.JRFillTextField.evaluateText(JRFillTextField.java:394)
    at net.sf.jasperreports.engine.fill.JRFillTextField.evaluate(JRFillTextField.java:368)
    at net.sf.jasperreports.engine.fill.JRFillElementContainer.evaluate(JRFillElementContainer.java:258)
    at net.sf.jasperreports.engine.fill.JRFillBand.evaluate(JRFillBand.java:499)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillBandNoOverflow(JRVerticalFiller.java:439)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillPageHeader(JRVerticalFiller.java:403)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(JRVerticalFiller.java:264)
    at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:128)
    at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:946)
    at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:864)
    at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:84)
    at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:624)
    at br.com.dscon.createpdf.BaseJasper.criaTemplate(BaseJasper.java:56)
    at br.com.dscon.createpdf.TesteJasper.gerarJasperDesafioSinistro(TesteJasper.java:97)
    at br.com.dscon.createpdf.TesteJasper.main(TesteJasper.java:22)

Quando boto valor estático funciona, mas quando boto parâmetro acontece isso