Error from NDSolve: PDE coefficient doesn't evaluate to numerical value

[nithiyav2022 (Nithiya V)]

while I’m solving system of pde it is showing the error that
"Equation or list of equations expected instead of "

[mroge02 (Michael Rogers)]

You are missing an equals, that is, ==, in the long expression. Perhaps you want to set it equal to zero, or perhaps you accidentally deleted part of the equation.

[nithiyav2022 (Nithiya V)]

Thank you for your reply, sir. Now I’m getting another error sir

[wolframcommunity (EDITORIAL BOARD)]

Welcome to Wolfram Community! Please make sure you know the rules: https://wolfr.am/READ-1ST

The rules explain how to format your code properly. Posting code Images doesn’t help other members to copy your code. Please EDIT your post and comment, and make sure code blocks start on a new paragraph and look framed and colored like this.

int = Integrate[1/(x^3 - 1), x];
Map[Framed, int, Infinity]

You can also embed notebook or attach notebook.

[nithiyav2022 (Nithiya V)]

Open in Wolfram Cloud ↗

In that code I’m getting as "Pde coefficient {0,} does not evaluate to a numeric matrix of dimensions {1,2} at the coordinate {0.5,0.5}; it evaluated to {0.,} instead.

[gianlucagorni]

There is an anomalous, invisible character in your first equation:

In[12]:= op1 // InputForm

Out[12]//InputForm=
\:f870*Derivative[0, 1][v][x, y] + 
 Derivative[1, 0][u][x, y]

[nithiyav2022 (Nithiya V)]

Thank you for your response.
Now I’m facing another issue that I haven’t use findroot but it showing the error on that part ill be attaching the notebook as well as the screenshot of what I’m getting as error.&

Open in Wolfram Cloud ↗