Basically, it happens when we use third party libraries.

Proguard doesn't work well with many of the libraries so we need to make changes in proguard file.

For example, to solve out the errors of retrofit library, we need to add these things in proguard file.

-dontwarn retrofit.*
-keep class retrofit.* { ; }
-keepattributes Signature
-keepattributes Exceptions
-keepclasseswithmembers class * {
    @retrofit.http. ;
    Chrome Version Support
        
Starting with Chrome version 45, NPAPI is no longer supported for Google Chrome. For more information, see Chrome and NPAPI (blog.chromium.org).
        
Firefox and Microsoft Internet Explorer are  recommended browsers for websites using java applets.
        Chrome Version Support
        
Starting with Chrome version 45, NPAPI is no longer supported for Google Chrome. For more information, see Chrome and NPAPI (blog.chromium.org).
        
Firefox and Microsoft Internet Explorer are  recommended browsers for websites using java applets.
        
Chrome Version Support
        
Starting with Chrome version 45, NPAPI is no longer supported for Google Chrome. For more information, see Chrome and NPAPI (blog.chromium.org).
        
Firefox and Microsoft Internet Explorer are  recommended browsers for websites using java applets.
    
Unable to start Java!! Mr. Nerd figure out why..
    
We have detected that Java plugin is not installed/enabled on your browser. Unfortunately some of our below listed tools require Java plugin:
                Desktop recorder.
                Error Screen capture.
                Time Tracker.
        To use our product please click on the link to install/Detect Java plugin. 
      You have exceeded the maximum number of characters allowed for a comment without sign in.
      Either enter Content Or Record
    Your Post will be visible in the listing once it has been approved by the administrator.
        Close
                    User name should have minimum 6 characters
                    User name already exists
                    Please enter alpha-numeric characters/dot/underscore
                    * Email
                    Please enter email
                    Please enter a valid email
                    E-mail already exists
                    Sorry, this domain is blacklisted
                      * Email confirmation
                      Please enter a valid email confirmation
                      Please enter email confirmation
                      Email confirmation should match email
                    * Password
                     Please enter password
                    Password should have minimum 6 characters
                    * Password confirmation
                    Please enter confirm password
                    Password confirmation should match the password
                      
Manage Company and Employee Profiles 
                      
Use Online Project Management Tools for Free 
                      
Company wide Employee Productivity Reports 
                      
Knowledge Sharing  and Collaboration Tools 
                      
Get Sales Lead and Bid for Tech Projects 
                      
Send Invoices and Receive Payment Safely