Startup Error

Hello

When starting Wowza error appears. What does this mean and how to solve it?

ERROR   server  comment 2019-04-04      10:59:06        -       -       -       -       -       0.319   -       -       -       -       -       -       -       -       loadConfigProperty: type Integer () : java.lang.NumberFormatException: For input string: ""|at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)|at java.lang.Integer.parseInt(Integer.java:592)|at java.lang.Integer.parseInt(Integer.java:615)|at com.wowza.util.XMLUtils.a(XMLUtils.java:136)|at com.wowza.util.XMLUtils.loadConfigProperies(XMLUtils.java:205)|

I also got same types of error.