UiPath-ADAv1 Version Control and Libraries Practice Question
Exhibit
System.Exception: The activity 'CustomActivity' threw an exception. Version 1.0.4. InnerException: 'Object reference not set to an instance of an object.'
Refer to the exhibit. Several developers are reporting this error when using a shared library. What is the most likely cause?
⚠ Common exam trap
Candidates often blame environment setup or network connectivity instead of looking at the component's internal design flaws regarding missing input validation.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The activity lacks input validation for optional arguments.
The 'Object reference not set' error in a library suggests a null value is being passed into a component that expects a initialized object. When multiple developers report this, it implies the library's design does not handle missing inputs gracefully. This highlights the importance of input validation in libraries, as shared components must be resilient to various usage patterns across different projects to prevent widespread failures in production.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The library package was corrupted during the upload to Orchestrator.
Why it's wrong here
Corrupted packages would typically cause installation errors or assembly load exceptions, not a runtime null reference exception within the activity logic. The error message indicates the activity is executing successfully but failing internally due to a logic flaw regarding object initialization, not a package transport issue.
- ✓
The activity lacks input validation for optional arguments.
Why this is correct
The NullReferenceException indicates that the code is attempting to access a member on an uninitialized object. By failing to validate that input arguments are provided or properly initialized, the activity fails at runtime. Developers should implement check logic to handle null or empty inputs gracefully within the activity.
- ✗
The project is using an incompatible version of the .NET framework.
Why it's wrong here
Incompatibility with the .NET framework would manifest as a TypeLoadException or a version mismatch error at compile time or execution start. A null reference exception is a logic error that occurs when the code runs, meaning the environment is likely compatible, but the code logic is flawed.
- ✗
The Git repository history is causing an invalid library compilation.
Why it's wrong here
Git history affects version control, not the execution logic of compiled C# code. If the code compiles and the package is published, the logic remains the same regardless of how many commits are in the repository. The issue resides in the code's handling of data, not the source control.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official UiPath exam blueprint
This UiPath-ADAv1 practice question is part of Courseiva's free UiPath certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the UiPath-ADAv1 exam.