Hello there!
Answer:
No federal court system -> Disagreements and lawsuits that extended across a state boundary could not be resolved by an impartial court with jurisdiction over affairs crossing states.
No executive branch of the federal government -> There was no person or federal department responsible for managing the work and mission of the federal government.
Congress could pass laws but could not enforce them -> Any civil or criminal violations of federal law were investigated and prosecuted by the states and only if the states happened to agree with the provisions of that law.
No source of income from taxation for the federal government -> Unable to raise taxes for a national military, to pay legislators and other officials, or other fiscal responsibilities, the federal government was always on the verge of bankruptcy.
Hope this helps!