Expected collection {(PageContent='Science is a rigorous, systematic endeavor that builds and organizes knowledge in the form of testable explanations and predictions about the world. Modern science is typically divided into three major branches: the natural sciences (e.g., physics, chemistry, and biology), which study the physical world; the social sciences (e.g., economics, psychology, and sociology), which study individuals ...', LookupStr='', Metadata={title:Science - Wikipedia}, {link:https://en.wikipedia.org/wiki/Science}), LookupIndex=0, (PageContent='English is a West Germanic language in the Indo-European language family, whose speakers, called Anglophones, originated in early medieval England. The namesake of the language is the Angles, one of the ancient Germanic peoples that migrated to the island of Great Britain. Modern English is both the most spoken language in the world and the third-most spoken native language, after Mandarin ...', LookupStr='', Metadata={title:English language - Wikipedia}, {link:https://en.wikipedia.org/wiki/English_language}), LookupIndex=0, (PageContent='Wikipedia, free Internet-based encyclopaedia, started in 2001, that operates under an open-source management style. It is overseen by the nonprofit Wikimedia Foundation. Wikipedia uses a collaborative software known as wiki that facilitates the creation and development of articles. Although some highly publicized problems have called attention ...', LookupStr='', Metadata={title:Wikipedia | Definition, History, & Facts | Britannica}, {link:https://www.britannica.com/topic/Wikipedia}), LookupIndex=0, (PageContent='A computer is a machine that can be programmed to carry out sequences of arithmetic or logical operations ( computation) automatically. Modern digital electronic computers can perform generic sets of operations known as programs. These programs enable computers to perform a wide range of tasks. The term computer system may refer to a nominally ...', LookupStr='', Metadata={title:Computer - Wikipedia}, {link:https://en.wikipedia.org/wiki/Computer}), LookupIndex=0, (PageContent='Manhattan District The Trinity test of the Manhattan Project on 16 July 1945 was the first detonation of a nuclear weapon. Active 1942-1946 Disbanded 15 August 1947 Country United States United Kingdom Canada Branch U.S. Army Corps of Engineers Garrison/HQ Oak Ridge, Tennessee, U.S. Anniversaries 13 August 1942 Engagements Allied invasion of Italy Allied invasion of France Allied invasion of ...', LookupStr='', Metadata={title:Manhattan Project - Wikipedia}, {link:https://en.wikipedia.org/wiki/Manhattan_Project}), LookupIndex=0} to have an item matching d.PageContent.Contains("encyclopedia").

Process completed with exit code 1.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Nullability of reference types in value of type 'Task<string?>' doesn't match target type 'Task<string>'.

Nullability of reference types in value of type 'Task<string?>' doesn't match target type 'Task<string>'.

Possible null reference argument for parameter 'context' in 'string AgentTask.Execute(string context = null)'.

Possible null reference return.

Possible null reference argument for parameter 'context' in 'string AgentTask.Execute(string context = null)'.

Possible null reference return.

Non-nullable field '_currentValues' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.